I tried to switch the current KAGRA IR laser to the new high power laser (HPL). The new laser was injected in front of AOM.

Last week I moved the AOM 5cm to PMC direction and I moved 2.5cm more today to make a enough space for X-stage with a steering mirror.

The new bean has been  aligned to PMC and mode matching has been done with proper lenses and their positions.

Still alignment and mode matching are not perfect at all, but it was succeeded in locking PMC with the new HPL!

I needed to modulate to obtain error signal of PMC, I used the cable of current 15MHz signal and connected to a new 15MHz modulator in the HPL box.

After this switching test, I recovered the current KAGRA laser and PMC lock. Every thing should be back except for the position of AOM.

I will try a little more tuning for PMC and lock for IMC with HPL next week.