Warning: Undefined variable $s in /var/www/public_html/osl/classes/DAO.php on line 959
NAOJ GW Elog Logbook
LOG-IN
Displaying report 1-1 of 1.
R&D (FilterCavity)
Print this report.
MichaelPage - 22:50, Friday 26 March 2021 (2421)Get code to link to this report
OPO replacement - characterisation of beam placed in ATC cleanroom

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.

Images attached to this report
2421_20210326144837_atcpicoptics.jpeg 2421_20210326144902_atclaser.png
Comments related to this report
MichaelPage - 12:18, Monday 29 March 2021 (2425)

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.

MichaelPage - 15:34, Friday 09 April 2021 (2443)

Axis of figure 2 should be "beam radius"