1. Nd:YAG Solid Laser System @ 3-2 / A-1 on the ground
2016/6/10

2. Yb fiber and Nd:YAG multi-stage solid laser @ 3-2

3. Yb fiber laser for 1064 nm Output power : 100 mW
(Pulse energy : 0.88nJ)
Spectrum
114MHz Pulse train

4. Strecher and pre-amplifier for 1064 nm
Output power : 1.0 W
(Pulse energy : 0.1μJ)
Spectrum
10MHz Pulse train

5. Nd:YAG amplifier

6. Nd:YAG amplifier

7. Wavelength conversion
To RF-Gun
From amplfier

8. Laser injection to 3-2 RF-Gun

9. 2016/3/29 ～ 30 GR_32 Study ・Laser energy 4.0mJ@1064nm 550uJ@532nm
・Under beam comissioning
SC_32_4R
SC_32_4

10. Yb fiber and Nd/Yb solid laser system on the A-1 ground
Yb fiber part (already installed)
Repetition frequency
114.24MHz
Wavelength selection
1030nm & 1064nm
Repetition frequency
10MHz
1064nm oscillator
(ANDi type)
Grating stretcher
(Transmission)
SOA
pulse picker
Yb single mode
fiber amp
Menlo
1030nm oscillator
FBG
Yb-doped double clad
fiber amp
ASE rejection
grating pair
1030nm oscillator
(ANDi type)
1064nm
1030nm
1030nm oscillator
(10.38 MHz)
EO pulse picker
Yb:YAG Thin disk
regenerative amplifier
1064nm
Nd:YAG
regenerative amplifier
Cryogenic Yb:YAG Thin disk
main amplifier
Nd:YAG
main amplifier
Nd:YAG
for Phase-II
Output(1064nm)
Output(1030nm)
Yb:YAG
for Phase-III
96ns Delay => Combine => SHG => FHG

11. EO module pulse picker
Pulse pick result
Repetition frequency : 10Hz

12. Nd:YAG Diode-pumped solid-state (DPSS) Laser
○ 4-state laser is easy to operate.
○ High power pump LD is available.
○ High gain efficiency.
○ Large crystal is available
× Small gain bandwidth. (Gaussian)
1.1% Dia. 4×93mm

13. Nd:YAG regenerative amplifier

14. On-going R&D for Nd Laser
Final amplifier for 5 nC generation => Nd disk stack laser with 885nm direct pump (Collaboration with IMS and Hamamatsu)
Nd disk stack laser
λ/4
Input
885nm
10 kW High Power Laser Diode Stack (Hamamatsu)
Pump
Output
Room temperature IMS

15. Three level laser of Nd

16. 885nm Direct Pump

17. Summary
Two Nd solid laser system are almost ready at 3-2 RF-Gun (Multi-stage) and A-1 RF-Gun (Regenerative amplifier).
Final amplifier for high charge generation is under development.