Participaint: Eleonora and Yuhang.

After the measurement of parametric ampkification, we considered to recover our filter cavity. But we found the beam was cut by EOM(GRMC/FC) and AOM. At the begining, we think we can recover the beam if we recover it for GRMC. However, it seems not like that.

Then we tried to align the beam better for EOM(GRMC/FC). We found the situation becomes better.

The entry 893 shows the spectrum of GRMC trasmission. I compared it with the GRMC situation now. I found there is a higher order mode is a little bit higher than before. Maybe this is the reason why we found the problem of beam cutting.

I am thinking maybe we can try to move the first lens(the lens just after SHG) to remove that peak.

Or tried to move 100mm lens just after the BS which seperates the beam going to GRMC and filter cavity.

Or we can further try to do the alignment of beam into AOM.