1. KAGRA Domestic Meeting Laser
17 April, 2013
Norikatsu Mio

2. Schematic diagram Mitsubishi laser modules 200 W 80 W
Fiber laser amplifiers
40 W
NPRO(500mW)
40 W

3. Laser
Coherent addition of two amplifier outputs has been tested. The current best was 41 W+42 W →78W.

4. Coherent addition of two laser outputs

5. Result of the coherent addtion
41W×2 =>78W Efficiency 95％
Bright port 78W
Dark port 4W

6. Long-term operation
Continuous Locking has been maintained over 4 hours.

7. Summary No progress from the previous f2f meeting.
In this year, we should assemble the solid state amplifier stage.