with Ushiba, Tamaki
We change of position of the CCD camera of the IR laser on TMSX.
Part of the optical table diagram(JGW-T1808962-v9) of Nagano-san was reproduced.
BS on TMSX was repositioned to measure the beam profile of DCQPDs of IR laser.
I even made the measurement, but the beam profile after RLNS2 was elliptical or this mode was not TEM 00.
I will check if the beam is elliptical today and re-measure it.
Thanks to Takase-san
I re-measured the beam profile of IR laser for placing DCQPDs.
Using the light reflected from RBS placed yesterday, I measured diameters of the x-axis and y-axis relative to the ground of the beam cross section and fitted them to Gaussian beam to find the waist point.
The results were further away from the waist than in previous measurements(JGW-T1808962-v9).
Ideally, the two QPDs should be placed around gouy phase ±45 degrees on the x and y axes, but this is difficult currently.
It may be necessary to adjust the two lenses(RLNS1 and RLNS2).
I observed the beam profile of RLNS from GR filter with CCD camera.
The mode appear to be striped and not be TEM 00.(fromGRfilter_toRLNS.tif)
I also observed a cross section in front of the periscope (although I was unable to take a photograph)
and it appears to be a mode similar to the former.
So it does not appear to be a clip on TMS.
Dataļ¼./users/Commissioning/data/ASC/2022/TMSX/BeamProfile/20220609/
