Upload
kera
View
43
Download
0
Tags:
Embed Size (px)
DESCRIPTION
VIRGO_LCGT Meeting Laser & Mirror. 5 November, 2010 Norikatsu Mio. Schematic View of LCGT Optical System. ETMY. Laser. MC1. MC3. ITMY. MT1. PRM. PR1. 780 W. ITMX. ETMX. 150 W. 75 W. MT2. BS. PR2. SR1. MC2. SRM. SR2. Laser for LCGT. Injection Locked laser Master: 2-W NPRO - PowerPoint PPT Presentation
Citation preview
VIRGO_LCGT MeetingLaser & Mirror
5 November, 2010
Norikatsu Mio
Laser MC1
MC2
MC3PRM PR1
PR2
BS
SR2
SR1
SRM
ITMX
ITMY
ETMX
ETMY
MT1
MT2
Schematic View of LCGT Optical System
780 W
75 W150 W
EOMFI
PD
PZT
Nd:YAG rod
Nd:YAG NPRO
quartz rotator
2W100W
BW
FI
QWP
PBS
WB-EOM
Intensity stabilization( Injection Current Contro
l )
150W
Frequency Stabilization
f < 10 kHzPZT, Crystal Temp.
10 kHz < f < 1 MHzWB-EOM
Injection Locked laserMaster: 2-W NPROSlave: Mitsubishi
Power Amplifier
High-Power Laser Modules
Mitsubishi
Laser for LCGT
Laser• Basic design has been tested with a prototype
laser.• Discussion with Mitsubishi that makes laser
modules for LCGT.– We will buy laser modules from Mitsubishi and
assemble a laser system from them by ourselves or by another company.
• Alternative choice?– Commercial fiber laser: 40W
Alternative design
Mitsubishi laser modules
Fiber laser amplifiers
NPRO(500mW)
40 W
40 W
80 W
200 W
Laser MC1
MC2
MC3PRM PR1
PR2BS
SR2
SR1
SRM
ITMX
ITMY
ETMX
ETMY
MT1
MT2
Size of these mirrors must be determined according to the design policy of the interferometer.
38cm
10cm
Mirrors for LCGT
Mirrors for Main cavitiesInitial: Silica
Final: Sapphire
Mirror
• Size of the mirrors for main cavities was determined as 25cm x t10cm in order to make full use of the iLIGO mirror substrates.
• Size of the beam splitter is 38cm x t12cm. The substrate will be prepared within this year.
• Concerning polishing and coating, several companies inquired the situations.
• We need to develop a new coating machine for large mirrors. Some Japanese companies may collaborate with us; this issue is under consideration.
• Polish: Collaboration with Riken Group– Details are not fixed.
Current Plan• For iLCGT, the size of the mirrors is chosen as that of iLIGO’s mirror.• BS and ITMs will be newly fabricated from Japanese Silica.
Laser MC1
MC2
MC3PRM PR1
PR2BS
SR2
SR1
SRM
ITMX
ITMY
ETMX
ETMY
MT1
MT2
LIGO mirrors(re-polishing and re-coating)25cm x t10cm
38cm x t12cm
10cm
New mirrors25 cm x t10cm
Sapphire• We need a C-axis mirror(25cm x t15cm).• Reply from GT Crystal systems
– Current Max size of • C-axis mirror: 20cm x t15cm• A-Plane mirror:25cm x t15cm• “With time we feel can develop larger C-axis sapphire slabs to
achieve your goal of 25cm x 15cm sapphire mirrors with our HEM growth process.”
• Inquiring– when we can obtain C-axis mirror of 20cm x t15cm?– price and delivery time of max size of C-axis mirror(20cm x t15cm) and
A-Plane mirror (25cm x t15cm).– No answer (the quotations will be made in this week!).
appendix
Laser module ( Mitsubishi )
Two rods and rotator Diffusive reflector +LD