NAOJ GW Elog Logbook 3.2
Yuhang and Michael
We will assemble the new OPO in the ATC cleanroom. We wanted to see if the laser beam set up in the corner is collimated. We measured the beam using the beam profiler from TAMA FDS cleanroom, with z = 0 being the position of the last lens that was fixed on the bench as we got here (figure 1).
Using curve fitting, we find the following fit of the beam size (figure 2), where blue refers to the horizontal axis and orange the vertical axis. The beam is not collimated and also a bit astigmatic. The fitting on the horizontal size also is quite distant from the data point closer to z = 0.
Comment on the characterisation of ATC cleanroom laser.
The beam profiler output shown in attached figures. We can see the beam position on the profiler for each measurement. The number on Gaussian -> 13.5% is taken as the beam diameter. V is the vertical axis and W is the horizontal axis.
Axis of figure 2 should be "beam radius"