MatchBox 2 series | User Manual

MatchBox 2 series | User Manual

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CONTENTS

INTRODUCTION ................................................. ... 5 SYMBOLS AND LABELS................................... ... 7

3 SAFETY ................................................................ ... 93.1 Optical Safety .................................................. ... 93.2 Electrical safety ............................................... ... 123.3 Electromagnetic compatibility......................... ... 124 DESCRIPTION AND SPECIFICATIONS ........... ... 154.1 Laser Output Specifications............................. ... 154.2 Mechanical Design .......................................... ... 154.3 Heat Management............................................ ... 184.4 Laser Output Options....................................... ... 194.5 Line-width Options.......................................... ... 234.6 Operating Environment ................................... ... 235 UNPACKING ........................................................ ... 256 OPERATION......................................................... ... 296.1 Attachment to a Heatsink................................. ... 296.2 Power and Signal Connections ........................ ... 306.3 UART bus........................................................ ... 326.4 Installing Control Software.............................. ... 326.5 Laser Control Software.................................... ... 336.6 Communication command table ...................... ... 436.7 Communication with multiple lasers in a bus.. ... 466.8 Modulation....................................................... ... 506.9 Attaching Control Interfaces............................ ... 507 ACCESSORIES..................................................... ... 537.1 Breakout PCB .................................................. ... 53

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7.2 UART-USB converter cable (part number: AM-C_)... 537.3 Adapter to M6 (part number: AM-H4)............ ... 547.4 Forced Air Cooler (part number: AM-H3) ...... ... 568 Troubleshooting Q&A ........................................... ... 61

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INTRODUCTIONThe ‘MATCHBOX 2 ’ series is a major platformupgrade of market beloved ‘MatchBox’ series,which includes a range of continuous wave lasersources, featuring wide range of wavelength,output power, output type and line-width options.

The series is composed of solid state (DPSS)lasers as well as direct laser diode (LD) lasers.Despite the different technical implementation,physical and electrical properties, usability andconnectivity are almost identical throughout theseries. Therefore Integrated Optics, UABprovides a single user manual for the entireseries and emphasis on differences betweenmodels is provided wherever necessary.

As the title hints, MATCHBOX 2 products areultra-compact, single-unit laser sources withoverall dimensions comparable to a regularmatchbox (30x50x16 mm, not taking into accountthe connector pins).

Please take your time to read this instructionmanual which provides essential information onthe usage of the laser. We have also includedvarious hints and tips that will help you get mostfrom a certain laser source.

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SYMBOLS AND LABELSAlong the text you will find icons designed to drawyour attention to different bits of safety orotherwise important information:

This icon draws your attention to importantinformation, related to the usage of a laser.

This symbol is a warning sign. It marks safetyprecautions related to optical laser radiation andalerts the operator to the danger of exposure tohazardous visible or invisible laser radiation.

This symbol is a warning sign. It marks safetyprecautions related to electrical safety and alertsthe operator to the presence of dangerousvoltage, which might appear on certainconditions. Electric shocks caused by suchvoltage may constitute risk both to the operatorand equipment used.

Figure 2-1. A label on a side of the laser indicates product safety information. MATCHBOX 2 lasers belong to the class 3B.

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Figure 2-2. Serial number is marked on the back of the laser body, right above the connecting pins.

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3. SAFETY

3.1: Optical SafetyLight, emitted from a laser source featureshazardous properties, as compared toconventional light sources, such as luminescentbulbs, light emitting diodes, etc. It is important forusers, who use a laser system, or other personsapproaching to it, to know the dangers involved.Only users, who are familiar with laser safetyshould use the laser system to minimize the risksof laser radiation-related accidents.

MATCHBOX 2 lasers are Class 3B laserproducts. Different models are arranged to emitup to 500 mW of visible or invisible (infrared)radiation.

The radiation is hazardous if the eye is exposeddirectly to the beam or to specular reflectionthereof. The risk of permanent eye damage oreven blindness increases with longer exposuretimes.

Diffuse reflections as those from paper or othermatte surfaces are typically not harmful if viewedat a distance of 1 m (3 ft) or larger.

The use of eye protection when operating theMATCHBOX 2 laser is necessary if at any

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circumstances the laser beam could be exposedto eye directly or through a specular reflection.

Eye protection in the form of spectacles orgoggles with appropriate wavelength filtering ispreferred. For example, eyewear absorbing inthe spectral region 180 to 532 nm are suitable forworking with e.g. 405 nm, 457 nm, 473 nm, 488nm, 491 nm, 515 nm and 532 nm MATCHBOX 2lasers, but probably will not suit 561 nm, 593 nmor radiation of the red and infrared regions.

Use of protection eyewear provides anothersignificant advantage - when working in darkrooms, laser radiation may haze your eyes evenif observed from diffuse reflections. Properlychosen eyewear will reduce or even eliminatesuch haze and extend productive hours.

The beam emitted from Class 3B lasers caneasily damage photosensitive surfaces like thosefound in photodiodes, CCD cameras orphotomultipliers. It is important to make sure thatan unattenuated beam does not strike any ofaforementioned devices directly. Calculation ofallowable fluence is necessary before using suchdevices with our lasers.

In addition to laser safety from the laser sourcealone, following safety precautions must befollowed:

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• Experimental setups must ALWAYS behorizontal and below eye level;• To avoid accidental exposure, never bendover or sight down. If something falls down fromexperimental setup, user must first turn off laserand just then pick up;• Use protective shields or filters to get rid ofunnecessary reflections and scattering;• User should never wear jewels, watcheswhile using the laser system to avoid thereflections from surfaces thereof;• The laser system must be used in a closedroom, because high power and collimated laserbeam can damage biological tissues even at longdistances;• Extreme caution must be taken when usingvolatile substances in laser operational area;• High level of ambient light in laser operatingroom should be maintained whenever possible,in order to keep the pupil of the eye as small aspossible and to prevent the risk of eye damage;• Warning signs must be posted near theentrance to the laser operation area and inside;• Use of laser must be limited to users, whoare completely familiar with the rules above.

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3.2: Electrical safetyElectrical safety is as important as optical safety.Electric shocks from an unsuitable or poorlygrounded power supply, can cause extreme pain,severe burns, cardiac arrest and can even belethal, that is why the operator should alwaysobey the safety measures below.

The laser body of MATCHBOX 2 is connected tothe ground - all internal electronics share thesame ground of the laser body.

User must make sure that the power supply usedwith MATCHBOX 2 laser has grounded pinconnection (preferably a medical type powersupply) and is well grounded and that there areno grounding interruptions with other devices,because it can be dangerous for the operator andcause malfunction of the laser.

3.3: Electromagnetic compatibilityThe European requirements for ElectromagneticCompatibility (EMC) are specified in the EMCDirective (published in 2004/108/EC).

Conformance (EMC) is achieved throughcompliance with the harmonized standardsEN55011:2009 for emission and EN61000-6-1:2007 for immunity.

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The laser meets the emission requirements forClass 3B as specified in EN55011:2009.

Compliance of lasers within the MATCHBOX 2series with the (EMC) requirements is certified bythe CE mark.

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4. DESCRIPTION AND SPECIFICATIONS

4.1: Laser Output SpecificationsThe MATCHBOX 2 series includes a variety oflasers featuring different wavelength and powerratings. the complete specification of the laserradiation are provided together with a certainlaser, which is sold to the Buyer.

A detailed specsheet incorporates output power,long-term and short term noise, line-width, beamquality and other useful specifications.

4.2: Mechanical DesignThe laser sources within the MATCHBOX 2series employ a single-box design, which meansthat all optics, power electronics and thermalmanagement components are located within asingle enclosure.

The overall dimensions of the laser are 30x50x16mm (WxDxH), not taking into account theconnecting pins, which are used for connectingthe laser to a power source and control interface.The pins extend approx. 10 mm from the back ofthe laser. Different output options, such as free-space output with or without a mechanical

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shutter, permanently fixed fibers, have differentarrangements on the front facet of the laser.

Figure 4-1. Top and side view drawing of the MATCHBOX 2 laser, free-space output option.

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Figure 4-2. Top and side view drawing of the MATCHBOX 2 laser, fiber coupled output option.

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4.3: Heat ManagementThe enclosure is made from a black passivatedcopper, which ensures superior heat dissipationthrough the sides and the bottom of theenclosure. The main direction for heat dissipationis through the bottom, therefore the enclosuremust be mounted on an additional heatsink forproper thermal management.

Depending on model, one or two thermo-electriccoolers (TEC) are equipped inside the enclosurefor thermal management of a pump laser diodeand associated optics. Thermal stabilization of allcritical components is very important for low-noise and efficient operation of the completelaser.

Depending on laser configuration, cooling of 5 to20 W (at 25 °C ambient temperature) may berequired in a form of conduction-cooled or water-cooled heatsink, attachable to the bottom side ofthe laser.

Also, depending on model, a suitable heatsinkmust have low thermal resistance. For DPSSlasers thermal resistance of <0.5 °C/W isrecommended, while for diode lasers <1 °C/W issufficient. <0.5 °C/W requirement is usually met

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by a larger passive copper heat sink or anactively cooled aluminium heat sink.

Integrated Optics, UAB offers variety ofaccessories for thermal management. Pleasecontact us for purchase.

For efficient cooling, make sure that there are noother heat radiating devices, such as heatexchangers, heaters or computers in theproximity of the laser.

For efficient cooling, make sure that the laser isnot covered with or obstructed by any obstacles,which could prevent air circulation around thelaser.

All MATCHBOX 2 lasers are equipped withinternal thermal protection feature. If the internaltemperature reaches 40 °C, the laser shuts downor starts to blink. If this happens, turn of the laserand ensure better heat dissipation by decreasingthe heat-sink temperature and increasing theheat-dissipation capabilities thereof.

4.4: Laser Output OptionsMATCHBOX 2 laser sources are offered in twomain configurations with respect to the type ofoutput of laser radiation.

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Free-space output is commonly used incompact (portable) laser setups, where workingarea (an object to be irradiated) is relatively closeto the laser source and the beam could bedelivered directly or using just few mirrors.

Furthermore, the free-space output versions canbe provided with an aluminium safety cap (notshown in pictures), which might be necessary fora scientific open-frame setup. The cap (as astandard, not provided with the laser) must beattached to the output window, whenever thelaser is not in operation or it could be shut for ashort period of time, in case minor adjustmentsneed to be made without stopping the laser, thusstable operation is not lost.

In all other cases, it is advisable to trigger theinterlock function found on all control interfacesof the MATCHBOX 2 laser.

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Figure 4-3. Free-space output version of the MATCHBOX 2 laser.

Permanent fiber pigtailed output has fewmodifications, though it looks essentially similar.The difference is in the fiber type, which isrepresented by the color of the PVC jacket. Multi-mode (orange jacket), single-mode (yellowjacket) or single-mode polarization maintaining(blue jacket) fiber could be arranged with thisoutput type.

It is readily used in microscopy and diagnosticsetups, where few laser sources are placed in adistance from the analytical device, e.g. amicroscope, and radiation of several

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wavelengths is delivered to the microscope viaoptical fibers.

Lasers with non-detachable fibers feature loweroutput power, and 2-3 times worse output powerstability, as compared to free-space versions.

Figure 4-4. Fiber pigtailed output version of the MATCHBOX 2 laser; blue fiber jacket represents a polarization maintaining fiber type.

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4.5: Line-width OptionsMost of MATCHBOX 2 lasers are offered in twoline-width options - broad and narrow, in otherwords, featuring respectively multiplelongitudinal modes or single-longitudinal mode(SLM). In all cases, the broad line-width optionmeans, that no additional measures were takento narrow the emission spectrum - it is as radiatedby a laser diode (in direct diode lasers) or a gainmedium (in DPSS lasers). The narrow line-widthoption means that special measures were takenin order to force (or filter) radiation of just singlelongitudinal mode (SLM in DPSS lasers) or juststabilized wavelength and one or just fewlongitudinal modes (in direct diode lasers).

Usually, the SLM version of DPSS MATCHBOX2 lasers feature line-width of <5 pm or thebandwidth is <50 MHz.

4.6: Operating EnvironmentMATCHBOX 2 lasers are designed to beoperated in non-condensing environment, in thetemperature range between 15 and 30 °C.Whether the customer needs to operate the laserat higher temperature, such option has to beprovided by Integrated Optics, UAB duringassembly of the laser. The temperature range

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can also be extended by attaching the laser to acold plate, which has surface temperature in theaforementioned range and good thermalconductivity parameters.

Dusty environment might cause collection ofdebris on an output window of the laser.Therefore special maintenance, such as cleaningof the exterior of the output window must beperformed from time to time in order to keep thelaser power within the desired power range andextend the lifetime of the laser.

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5. UNPACKINGEvery MATCHBOX 2 unit is packed in anantistatic foam package, which is arranged toprotect electronics inside the laser from chargeaccumulation and is absorbing mechanicalshocks well during transportation. Further thefoam is packed into a carton.

Figure 5-1. The package of a MATCHBOX 2 laser.

During unpacking, cut the box sticker along theopening edge, but when opening, keep the box ina horizontal position.

Typically a package contains:

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• one laser source;• one breakout cable for USB and DC power;• 2 pieces of M2.5 hex bolts;• one hex key;• a user manual.

Power supplies and bigger accessories, such asheat-sinks or external control interfaces, ifprovided, are packed separately.

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Figure 5-2. The MATCHBOX 2 laser and its accessories fitted in an antistatic foam inlay.

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6. OPERATION

6.1: Attachment to a HeatsinkThe MATCHBOX 2 series includes DPSS anddirect diode lasers, whereas the higher powerDPSS lasers tend to generate more excessiveheat than the diode lasers.

Furthermore, all MATCHBOX 2 lasers areequipped with a TEC (Peltier) thermalmanagement, which, when operated, generateseven more heat to stabilize optical cavity andelectronics inside the laser, thus it is required toattach the laser enclosure to an external heat-sink, such as an aluminium breadboard or awater cooled plate.

In case a laser installation does not meetheatsinking requirements, internal thermalprotection stops the laser operation wheneverthe internal temperature reaches around 40degrees Celsius.

As an accessory, Integrated Optics, UAB offersfew heat-sinking solutions, including self-sufficient forced air cooler or a breadboardadapter plate (See “ACCESSORIES” onpage 53.), which is used to fasten the laser to a

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standard 25 mm M6 thread pattern of a standardoptical table or breadboard.

Thin layer of good conductivity thermal greasemust be applied to the interface between thelaser and the heatsink.

6.2: Power and Signal ConnectionsAll MATCHBOX 2 lasers, are powered from a +5V DC power supply. Depending on wavelength,output power and temperature of a mountingsurface the laser might require up to 5 Amps (25W) power supply.

The OEM version of the MATCHBOX 2 lasercomprises a flexible PCB ribbon with 7x2.54mmor 8x2.54mm female pinhead connectors, asdepicted in Figure 6-1.

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Figure 6-1. Connecting pins with 2.54 mm spacing on the back side of the laser; pinout.

Viewing right to left, the pins are dedicated for:one pin for +Vcc, next two are UART businterface pins Tx and Rx, then follows amultifunctional pin (TTL modulation or fan speedcontrol). TTL or FAN setting is selected from thelaser control software.

An empty slot is used as a key, ensuring that thefemale pinhead connector will not be inserted ina wrong orientation or position.

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The fifth pin works as a ground. The ground pinis soldered into the enclosure of the laser, thuscomplete laser body is grounded.

6.3: UART busUART (Universal Asynchronous Receiver/Transmitter) is a commonly used communicationdevice in computer based systems. This form ofserial communication is compatible with USB andRS232:

• Single message where a master writes datato a slave;• Single message where a master reads datafrom a slave;• Combined messages, where a master issuesat least two reads and/or writes to one or moreslaves.

6.4: Installing Control SoftwareUsers of MATCHBOX 2 lasers can download acontrol software from the web directory ofIntegrated Optics, UAB. For this downloadplease contact us [email protected]

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In order to install the software, extract installationfiles from a RAR compressed folders and run thefile ‘Setup’.

Figure 6-2. Initial installation window.

Installation procedure is very short. After that thecontrol program can be launched by finding‘MatchBox 2 Control’ among installed programsor by searching this in a search field of Windows.

6.5: Laser Control SoftwareThe control software incorporates many usefulparameter settings and readings. It also displays

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operational hours and times the laser has beenstarted.

The software window is shown in Figure 6-4. Thewindow comprises 3 columns, which display themost important information about a particularlaser. The first column show information aboutlaser settings, the second column showinformation about actual readings of laserparameters and the third column indicates laserproperties, like model, serial number, operatingtime, etc. The third column also shows a radiationsign whenever the laser radiation is turned on.

Figure 6-3. Main software window.

There are two versions of the software – Useredition (strongly limited functionality) andIntegrator edition (less limited functionality). User

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edition allows changing only the optical power.Other parameters are locked. This way the laseris working in its optimum mode, at factorysettings.

Figure 6-4. Laser control software window when a laser is connected and radiating.

After launching the software, connect the laser tothe computer. Press ‘Search Device->Finddevice’.

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Figure 6-5. In order to detect the laser and start communication, press ‘Search Device ->Find device’.

Figure 6-6. Once the laser is identified, the fields are filled with information.

Whether some parameters are changed, they arenot saved automatically. This is doneintentionally for several reasons. Whether the

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new laser parameters make the laser operateundesirably, the user can always simplydisconnect the laser from USB and power supplyand connect it again - the old settings will berestored and displayed on the screen.

Another reason not to write new parameters inthe memory is limited write cycles of the EPROM.Especially if integrators are making their owncontrol software, having for example a slider forpower setting, one stroke of such slider mightresult in hundreds of values saved in theEPROM, reducing its cycle capacity.

In order to save newly set parameters in the lasermemory, user must press ‘Device functions->Save settings’.

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Figure 6-7. In order to save newly set parameters in the laser memory, user must press ‘Device functions->Save settings’.

Figure 6-8. ‘Always on top’ setting can be found under ‘Application settings’.

Further we will briefly describe particular lines ofthe software window.

Table 1: Explanations of software fields.

Field Meaning UserEditable

ILD max. Maximum current for the laserdiode.

No

TEC1 temp. Target temperature of the firstPeltier cooler

Accesslevel 2

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TEC2 temp. Target temperature of thesecond Peltier cooler

Accesslevel 2

Optical Power Target optical power of thelaser. Can be set in DAC valuesor mW, if the power calibrationwas done

Accesslevel 1a

LD current actual LD current No

TEC1 temp.(readings)

Actual temperature of the firstPeltier cooler

No

TEC2 temp.(readings)

Actual temperature of thesecond Peltier cooler

No

Body temp. Temperature of the laserenclosure

No

Access level User access level; 1 - basicconfiguration, 2 - widerconfiguration

Yes, withpassword

Laser self startafter power on

If checked, the laser will startwhenever DC power is applied.

Yes

a. Power change is not recommended for SLM lasers - thismight influence spectral properties of the laser.

Table 1: Explanations of software fields.

Field Meaning UserEditable

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Laser control software will not work if a laser isnot connected to a power supply. In the firstinstance, the laser should be connected to PC viaUSB cable. Only then the laser should beconnected to the power supply using a breakoutcable or a breakout PCB.

Laser will start emitting light as soon as Startbutton is pressed. Please make sure that there isno risk of getting the laser radiate to an eye orskin of a person, as outlined in the SAFETYchapter.

Before starting the laser, make sure that the capis taken off of the output window or a fiberconnector.

After connecting the laser to a PC via USB port,all information that is saved inside the laser willbe read and displayed in the computer screen.Information about laser firmware version, serialnumber, model, operating time and times laserwas started will be provided on the right side ofthe application window.

More than one laser can be connected to acomputer simultaneously. All connected laserscan be controlled with multiple program windows– one for each laser. Once connected, lasers aredetected automatically. If a newly connected

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laser is not found, use a function 'Search Device'in the top bar.

The lasers in MATCHBOX 2 series can haveeither one or two TEC (thermo-electric cooler)elements arranged inside the laser body. OneTEC is used for thermal control of a laser diodeand another TEC can be used either for VBG (indirect diode lasers) or non-linear crystal (in DPSSlasers with second harmonic generation). Bothtemperature values will be displayed in theprogram window. The user can also observe apercentage of TEC capacity, which is being used.If TEC value is near 100% for more than 10seconds, it means that the laser does not getenough cooling and it heats too much. In suchcase, the laser will turn off automatically ifmaximum threshold temperature will be reached.

Next to LD current reading, there is an indicatorhaving two values: ACC (Automatic CurrentControl) and APC (Automatic Power Control).Normally, the laser should be working in ACCmode while it is warming-up and in APC modeafter reaching target temperatures on TECs.

There is a check box named 'Laser self start afterpower on'. It can be changed any time laser isconnected to a PC.

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Default laser parameters will be displayed, oncethe laser is connected to the computer. In orderto save customized parameters, click 'DeviceFunctions -> Save Settings'.

In case some parameters have been changedbut not saved, default settings can be restored bygoing to 'Device Functions – Read Settings’.

CHANGING OUTPUT POWER

In order to change the optical power of a laser,DAC value should be entered. Possible DACvalues are from 0 to 4095, however each laserhas a pre-set power limit and sometimesmaximum optical power value will be lower than4095 DAC value.

If the laser power is calibrated, calibration valuesare saved in the micro-controller. In such case,the optical power can be entered in mW.Calibration process can be either done in thefactory or it could be done by the user. Forcalibration instructions, please contact our techsupport team writing an email [email protected].

Calibration is also possible for fiber coupledlasers, as well as for a complete turnkey system,e.g. microscope setup.

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6.6: Communication command tableThe following commands are used withMATCHBOX 2 series lasers.

Table 2: Communication commands of MATCHBOX 2 lasers.

Command Function Argument Returnedvalue

e˽ start/stop laser 1 or 0 <ACK> or<ERR>

c˽3˽ set LD current to180mA

180 <ACK> or<ERR>

c˽4˽ set 100mW opticalpower using polynomtable

100 <ACK> or<ERR>

c˽5˽ direct current set toDAC 12bit full range

2000 <ACK> or<ERR>

c˽6˽ set optical power DACin 12bit full range

1100 <ACK> or<ERR>

c˽a˽ enable/disableautostart after poweron

1 or 0 <ACK> or<ERR>

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r˽s receive settings.Returned values are:Set T1 [integer] deg,Set T2 [integer] deg,set LD current[integer] mA, setOptical power[integer] 12bit range,Optical power [float]mW, Max allowed LDcurrent [integer] mA,Autostart enable[boolean], access level[integer]

- 1800 1829150 840 nan180Autostart:OFF 0

r˽r receive readings.Returned values arevarious parameters ofthe laser: NTC1,NTC2, NTC3 (bodytemp), LD current,TEC1 load %, TEC2load %, Laser status

- 27.38627.08624.9780.0mA 0%0% OFF



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r˽i show laserinformation. Returnedvalues are: firmwareversion, serial number,product code,operating time, LDturn-on times.

- FirmwareforMatchBox IIv1.6.5Laser S/N:915322Laser model:405L-21A266h 15min.58 times

ID? return product ID. 6digit value is returnedwith random delay upto 1000ms

- <123456>

NM? Returns laser name -the product code.

- <405L-21A>

r˽t receive operatinghours. Returnsinformation aboutoperating hours andhow many times thelaser diode has beenswitched on.

- 266h 15min.58 times

r˽p receive optical powerpolinom members

-



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6.7: Communication with multiple lasers in a bus

There are several ways, how integrators canconnect and control multiple lasers in a singlecommunication bus. Our engineers have testedand recommend connecting diagram as depictedin Figure 6-9.

r˽m receive operatingmode (APC/ACC)

-

r˽l receive access level - Accesslevel: 0

f˽s save changes - <ACK> or<ERR>



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Figure 6-9. Suggested communication diagram for multiple lasers in a single bus.

This communication diagram is based onsimultaneous communication from the systemUART controller to all connected lasers and

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individual response from a particular laser orrandom timing response from all lasers to thesystem UART controller.

One example of such communication is shown inFigure 6-10, where system UART enquires alllasers in the bus to send their IDs. All lasersrespond randomly. Communication from a singlelaser takes less than 20 ms.

Random communication from laser side, inresponse to general system UART enquiry,raises non zero collision probability, especiallywhen the number of lasers becomes large. Insuch case collided responses are rejected. TheID request must be repeated.

All communication from the laser side featurescommands with ‘<’ ‘>’ beginning and endsymbols.

New laser can be connected while others areoperating. ID request is repeated in order tocollect IDs once again.

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Figure 6-10. ID request sent from system UART to a bus with multiple lasers.

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6.8: ModulationModulation can be made using UART controller(digital). UART modulation allows to set powerwith a 12bit resolution and update the powersetting with a 6kHz rate. Which means that thelaser can be modulated max. 3 kHz at a 50:50duty cycle.

Modulation is possible between any two powerlevels. For example, between 0 mW and 50 mWor 20 mW and 50 mW, etc.

Waveform generation is also possible at a lowerrepetition rate of ~24 Hz.

6.9: Attaching Control InterfacesThe pins of the laser can be attached to controlinterfaces, which are designed as accessories ofthe MATCHBOX 2 series. On the other hand, inOEM arrangements, the pins can be connectedto a custom electronics within a laser workstationor portable laser equipment, which is arranged towork as a control interface for the laser.

Orientation of the pinhead has to be taken inaccount, when connecting a control interface tothe laser.

All pins of the laser must connect tocorresponding pins in the control interface.

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Wrong connection of the pinhead might lead topermanent damage of the laser electronics.

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7. ACCESSORIESMATCHBOX 2 lasers are designed with allnecessary power electronics and micro-controller unit placed inside the laser headenclosure. Just control interfaces are attachableto the pins at the end of the laser body.

7.1: Breakout PCB

7.2: UART-USB converter cable (part number: AM-C_)

Figure 7-1. UART-USB cable is used for PC communication and DC power.

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The UART-USB cable is a breakout cable,having two connectors - DC power connector for+5VDC power input and a regular USB-A maleconnector, which is used for PC communication.At the laser side the cable has just a single 6 slotpinhead connector.

7.3: Adapter to M6 (part number: AM-H4)The adapter to M6 is a universal mounting plateboth for conduction or water cooling. It is made ofcopper in order to ensure best possible heatdissipation from the bottom surface of aMATCHBOX 2 laser to a larger mountingsurface, such as an optical breadboard, etc.

Figure 7-2. A laser mounted onto the adapter.

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Figure 7-3. Several lasers mounted on adapters to M6; such arrangement is space saving.

The adapter set comprises two standard M6 boltsand a small syringe of thermal grease. Theadapter plate comprises two connectors for watercooling.

The adapter to M6 does not dissipate theexcessive heat from a laser itself, it just transfersthe heat to a larger surface or to into water forheat dissipation.

Always apply a thermal grease to both surfacesof the adapter. The layer of thermal grease shallbe as thin as possible, but it should cover theinterfaces between a laser and the adapter and

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between the adapter and an optical breadboardhomogeneously.

7.4: Forced Air Cooler (part number: AM-H3)An actively air-cooled heat-sink is made ofanodized aluminium. It incorporates a 5V fan andthreaded holes for fastening of a MATCHBOX 2laser in two different orientations and otheroptomechanics holders.

Figure 7-4. MATCHBOX 2 laser mounted on the forced air cooler.

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The forced air cooler is arranged with the fanwires coupled into a pinhead connector such thatit could be connected to the corresponding pinsof a breakout PCB, in order to provide +5VDCpower.

Always apply a thermal grease to the interfacebetween the laser and the cooler surface. Thelayer of thermal grease shall be as thin aspossible, but it should cover the completeinterface area of the laser.

All threaded holes in the forced air coolercomprise an M2.5 thread, therefore M2.5 boltsshall be used for attaching the MATCHBOX 2laser.

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Figure 7-5. The forced air cooler is fastened to a standard 1/2” post.

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Figure 7-6. The forced air cooler is fastened to two standard 1/2” posts and the laser is in upside down orientation. Such fastening is good for best performance of the forced air cooler and fairly good mechanical

stability.

For most efficient functioning of the forced aircooler it should be arranged in an open space.The heat-sink protrusions form multiple airchannels and upon operation of the fan,directional airflows are formed inside thosechannels, providing efficient heat dissipation.

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The fan can be connected in two ways. In onepolarity it sucks air from below and blows ittowards the protective grill. In another polarity itblows the air into the aluminium mounting plate.The second way of operating the fan has adisadvantage that heated air is blown in front ofthe laser output. Created turbulences can causedistortions of the beam profile and affect beampointing stability. If this is sensitive to anapplication, make sure that the polarity of the fanis selected such that the fan blows the air towardsthe protective grill.

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8. TROUBLESHOOTING Q&AWhether there are any technical issuesconcerning our products or any generalquestions, we are always willing to answer itas fast as possible via email or phone.

In order to save both our and our clients time, wehave provided a list of frequently askedquestions.

Frequently Asked Questions:

• Q: What type of power supply should Iuse?A: It should be 5V output power and 5A max out-put current for DPSS lasers and 3A output for di-ode lasers. We highly recommend to use thesame power supply as we offer on our website.Otherwise we cannot ensure that the laser wouldwork the same as it was tested during production.• Q: Power has dropped drastically. Whathappened?A: Please check if heat dissipation is sufficient.Launch the laser control software, check whetherthe TEC is not operating at 100% capacity. Whatis the voltage between +5Vcc and GND pins? Itshould be not less than 4.9V and not exceed5.5V. In case the voltage is different, wires might

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be too long or too thin or other components areinvolved that might cause voltage drop/increase.• Q: How to be sure that laser gets enoughcooling?A: During production, our lasers are tested on alarge aluminium breadboard - this is one examplehow to dissipate heat. Keep in mind that steel hasvery poor thermal conductivity, therefore conven-tional optical tables and breadboards are not suit-able for heatsinking of DPSS lasers. Customershould always use thermal grease when mount-ing the laser. Body temperature of the lasershould not exceed about 35°C, and the TEC loadshould not exceed 80%, with rare exceptions. Di-ode laser needs no more than 15 W heat dissipa-tion. DPSS lasers usually require more – about20W to 25W heat dissipation. All diode lasersand majority of DPSS lasers in the MATCHBOX2 series could work properly attached to ourforced air cooler.• Q: What accessories are needed in orderto use Matchbox laser?A: The MATCHBOX 2 series is designed forOEM applications. Integrators can install the la-ser without any other accessories, just by provid-ing 5V power and UART control signals tocorresponding pins on the back of the laser.However for quick setup, a breakout PCB or a

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breakout cable is a good help to start the laserand connect it to a PC via USB. Breakout PCBand a standard USB cable is always included inthe laser package free of charge. Also powersupply and AC power cable are necessary. Youshould have in mind that power supply should beordered separately and that power cable is not in-cluded in the package with the power supply.• Q: What is the breakout PCB?A: Breakout PCB is a small printed circuit boardattachable directly to the pins of the laser. Thiselectronics board features a soldered DC powercable, an SMA modulation signal cable, a fandrive cable. Furthermore it incorporates aUART-to-USB converter chip (SiLabs) and a mi-cro USB socket.• Q: I changed the laser power in the con-trol software, but after restart of the systemthe new power setting was not saved?A: New parameters are not saved in the micro-controller of the laser unless ‘Device functions ->Save settings’ is activated. This is done to saveEPROM write resource.• Q: What is fiber core diameter?A: We use fibers from many different vendors.Whether you need to know the actual fiber de-tails, please contact us in order to get detailed in-

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formation, such as core diameter or NA of thefiber.• Q: When do I have to use FC/PC and FC/APC fiber connector?A: We recommend to use FC/APC for SLM lasers- this is to avoid back-reflections from a polishedfiber tip to the laser cavity. In all other cases bothFC/PC or FC/APC connectors can be used, de-pending on users preference.• Q: Should I ensure grounding for the la-ser?A: We recommend that the laser would bemounted to a breadboard which is properlygrounded. Electrical socket where power supplyis connected must be grounded too. We sell pow-er supplies having grounded pin only.• Q: Can I modulate the laser with PWMsquare wave?A: Yes. It could be modulated using computercontrol, by sending commands over the UART in-terface.• Q: Do I get a replacement if the laser isbroken?A: Lasers within warranty period are repaired orreplaced free-of-charge. Warranty becomes ab-solete in cases indicated in the chapter ‘Warran-ty’.

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• Q: I have ordered an SLM laser, but canobserve more than one longitudinal mode.How can I solve this problem?A: It is possible that laser is working at non-opti-mal temperature point. First step is to make sureif the laser gets enough heat dissipation. Secondstep is to adjust laser diode (or cavity) tempera-ture using the laser control software. For this ac-cess level 2 is needed. Please contact IntegratedOptics, UAB for further instructions.• Q: Laser is working, but it's body is veryhot.A: First of all it means that laser diode should befine, but it could be that heat dissipation is notsufficient. You should check how much Amperesdoes the laser consume. It should be no morethan 1,5A for diode lasers and no more 4A forDPSS lasers.• Q: Laser emits no light at all. Power is0mW.A: First of all it could mean that safety fuse hasblown down. The fuse can be replaced only at thefactory. Secondly, internal coldplate of the laseris more than 45 C temperature. Third option isthat laser fiber could be not fully straightened upor even damaged. You should check for anydamages on the fiber itself or its connector.

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Recommendations:Before turning the laser on, proper cooling of thelaser should be ensured. Laser should bemounted using thermal grease and the screwsthat were provided with the laser. Please makesure that thermal grease is put very evenly andcovers whole bottom of the laser. If laser is fibercoupled, the fiber should be carefullystraightened up first.

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WARRANTY

Integrated Optics, UAB warrants theMATCHBOX 2 laser to the original purchaser(the Buyer) only, that the laser system, that is thesubject of this sale, (a) conforms to specificationsprovided before a certain laser has been shippedto the buyer and (b) is free from defects inmaterials and workmanship.

The MATCHBOX 2 lasers are warranted toconform to Integrated Optics, UAB publishedspecifications and to be free from defects inmaterials and workmanship for a period of: • 12 months or 5000 hours of operation,whichever occurs first, for blue and UV range(300 nm to 500 nm) direct diode lasers.• 12 months or 1000 hours of operation,whichever occurs first, for red range (633 nm to660 nm) direct diode lasers.• 12 months with unlimited operational hoursfor the rest of the series.

The Buyer is responsible for providing theappropriate utilities and an operatingenvironment as outlined in the product literature.Damage to the laser system caused by failure ofthe buyer's utilities or failure to maintain an

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appropriate operating environment, is solely theresponsibility of the buyer and is specificallyexcluded from any warranty, warranty extension,or service agreement.

The Buyer is responsible for promptnotification to Integrated Optics, UAB of anyclaims made under warranty. In no event willIntegrated Optics, UAB be responsible forwarranty claims made later than seven (7) daysafter the expiration of warranty.

LIMITATIONS OF WARRANTY

The foregoing warranty shall not apply to defectsresulting from:• Components and accessories manufacturedby companies, other than Integrated Optics,UAB, which have separate warranties,• Improper or inadequate maintenance by thebuyer,• Buyer-supplied interfacing,• Operation outside the environmentalspecifications of the product,• Unauthorized modification or misuse,

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• Improper site preparation and maintenance,or• Opening the laser housing.

THIS WARRANTY IS EXCLUSIVE IN LIEU OFALL OTHER WARRANTIES, WHETHERWRITTEN, ORAL OR IMPLIED, AND DOESNOT COVER INCIDENTAL ORCONSEQUENTIAL LOSS. Integrated Optics,UAB SPECIFICALLY DISCLAIMS THE IMPLIEDWARRANTIES OF MERCHANTABILITY ANDFITNESS FOR A PARTICULAR PURPOSE.

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Documents

MatchBox 2 series | User Manual