Laser stability
Takuya Natsui
Oscillator phase lock stability
Cavity length drift Phase lock stability PriceMenlo products << 0.1 um 0.0 (detection
limit)$ 150000
(1800 万円 )Oscillator 1 3 um 2.0 deg $ 35000 (400万
円 )Oscillator 2 1 um 0.58 deg $ 35000 (400万
円 )Oscillator3ANDi type
1 um 0.64 deg $ 35000 (400万円 )
Stability: 0.58 deg
Stability: 0.64 deg
Stability: 2.0 deg
Piezo position (cavity length drift)
Oscillator phase lock system
Zurich Instruments UHFIL Lok-in Amplifier
Stability: 1.5 deg in 2856 MHz
0.3 deg in 571 MHz
0.056 deg in 114 MHz
Commercial products also tested
Developed synchronization system Commercial products
Stability: 1.5 degStability: 0.64 deg
Compared in same oscillator, developed synchronization system has enough capability.
$10000 $60000
laser operation log
Laser system and detect point
Yb-doped fiber oscillator with
Transmission grating
Yb-doped fiber pre amplifier
Yb-doped fiber main amplifierPulse picker
Yb:YAG thin-disk multi-pass cavity amplifier
Yb:YAG thin-disk multipass amplifier ×3
SHG
Synchronization system
SHGRF GUN
51.9 MHz
2, 5, 25, 50 HzSingle or Double bunch
0.2 nJ @ 1037 nm
Yb-doped fiber main amplifier
Transmission grating pair
stretcher
2856 MHz triggerFrom Accelerator
Yb-doped fiber pre amplifier
>μJ @ 1037 nm
Pulse picker
10 MHz
Fix the configuration to 25 Hz operation
PD2PD1
PD3
PD4
Power meter
We have five constant monitoring points.Photo diode x4, Power meter x1
Detector (photo diode)
Laser pulse power is detected with photo diodes and oscilloscope.
start-up
First, fiber amplifier drifts
Fiber amp.
Disk amp.1
Disk amp.2
Disk amp.3
Laser is stabled gradually
Sometimes fiber amplifier drifts
Disk amplifier is damaged
Recently, 1 or 2 days stabilization was achieved.
FixDisk amplifier is damaged
BPM error
Recent operation log
We achieved two days stable operation.
(0.7 +/-0.3 nC)
BBO
Fundamental laser power
Beam charge
Still long term drift occur.
We will increase detection points. Develop power feed back systems.
Pointing stability detector is also developing with quadrant sensor.
52 MHz
2856 MHz
INPUT 1
INPUT 2
INPUT 3
INPUT 4
2856 MHzBPF
52 MHzBPF
Oscillator signal
Oscillator phase detect
52 or 114 MHz IQ signal
2856 MHz IQ signal
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