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CTF3 CTF3 Laser StatusLaser Status
Massimo PetrarcaMassimo Petrarca
CLIC January 23 2008
3-pass Nd:YLF amplifier
x300
3 pass Nd:YLF amplifier
x5
Probe Beam
General LASER General LASER LayOUT:LayOUT:
Optical gate (Pockels cell)24
UV pulses
1.24 s
Drive BeamBrewster plate
1.5 GHzNd:YLF
Oscillator
1.5 GHzNd:YLF
preamplifier
PhaseCoding
Micro pulses at 1.5 GHz~666ps
400us amplification windowfor AMP1
Macro pulse
200us amplification windowfor AMP2
Macro pulse
General pulse structure General pulse structure layoutlayout
not in scalenot in scaleOscillator
& Preamplifier
1.5 GHz; 10W AVG
Power
AMP1 @ 90A400 us;
5Hz 3KW Peak
Power
AMP1 + AMP2@90 A
400 us;200us5Hz
14 KW Peak Power
400us amplification windowfor AMP1
Macro pulse
200us amplification windowfor AMP2
Macro pulse
Micro pulses at 1.5 GHz
~666ps
Step by Step characterizationStep by Step characterization
Time structure (3 passes configuration) of the macro pulse coming out of AMP1
Power, Energy Measured @ 90A
Zoom in
The peak power of the macro pulse thus the the gain and micro pulse energy
are well above the specs
1.5 GHzNd:YLF
Oscillator+preamplifier
3-pass Nd:YLF amplifier
400 s, 5 Hz
diode pump 15 kW
Project specification:~3 kW ; 2 J/pulse 3 pass Nd:YLF
amplifier
diode pump 5 Hz
Step by Step characterizationStep by Step characterization
Time structure (2 passes configuration):Gain, Peak Power and Energy when AMP1 and AMP2 are both
90A
1.5 GHzNd:YLF
Oscillator+preamplifier
3-pass Nd:YLF amplifier
400 s, 5 Hz
diode pump
3 pass Nd:YLF amplifier
5 Hz
diode pump
Project specification:~15 kW ; 10 J/pulse
Which is the expected value for the amplifier output power when diode arrays are driven by 90amps current (18 KW
pumping power) each?
3-lens system with 1.2 magnification yields a good matching between the
transverse beam size of the beam and the rod.
Preamplifier & AMP1 output VS
Oscillator
0
2
4
6
8
10
12
0 100 200 300 400
Oscillator Power, mW
Am
plif
ier
po
wer
, W
Preamp power, W
Amp1 power, W
1.5 GHzNd:YLF
Oscillator
1.5 GHzNd:YLF
preamplifier
PhaseCoding
3-pass Nd:YLF amplifier
x300
AMP1 behavior vs
oscillator input power
In order to obtain an AMP1
satisfactory power response
an oscillator power
of at least 36 mW is needed.
AMP1 power for 288mW oscillator output
0
500
1000
1500
2000
2500
3000
3500
4000
200 300 400 500 600 700 800 900
Time, us
Po
wer
, W
AMP1 power for 36 mW oscillator output
0
500
1000
1500
2000
2500
3000
3500
4000
200 300 400 500 600 700 800 900
Time, us
Po
wer
, W
AMP1 oscillation behavior vs
oscillator input power
In order to obtain an AMP1 satisfactory power response an oscillator power of at least 36 mW is
needed, but oscillation in the beam intensity increases the oscillator output power limit from
36mW to 82 mW
AMP1 power for 82 mW oscillator output power
0
500
1000
1500
2000
2500
3000
3500
4000
200 300 400 500 600 700 800 900
Time, us
Po
we
r, W
ConclusionConclusion::
• The power of the first amplifier is satisfactory as well as The power of the first amplifier is satisfactory as well as the time structure (saturation region). Its transverse beam the time structure (saturation region). Its transverse beam
profile has to be optimize profile has to be optimize • Regarding the second amplifier:Regarding the second amplifier:
the power is still not satisfactory for the specification of the the power is still not satisfactory for the specification of the project. Which should be the value for the pumping power project. Which should be the value for the pumping power in order to obtain the 15 KW of the amplified beam? (Talk in order to obtain the 15 KW of the amplified beam? (Talk
to RAL). The transverse beam profile is satisfactory to RAL). The transverse beam profile is satisfactory comparing it with the beam profile of the input (into comparing it with the beam profile of the input (into
AMP2).AMP2).• Investigation of the oscillation in the amplified beam for Investigation of the oscillation in the amplified beam for
36mW of input power into the preamplifier must be done: 36mW of input power into the preamplifier must be done: are the oscillation causes by instability of the preamplifier are the oscillation causes by instability of the preamplifier
or by AMP1? or by AMP1? • Pockels cell is installed and works properly.Pockels cell is installed and works properly.
• Installation of the quadrupling crystals will be done in few Installation of the quadrupling crystals will be done in few days. days.
The End