Madi, Camilla

This week we went down to EX and installed the OzOptics fibre pig-tailed 532nm 5mW laser, and co-aligned it with the HWS 532nm LED beam.
Out-of-fibre the laser power was 4mW, and after the PBS the power was ~1mW (compare to HWS LED at the same location, power was ~1uW)
The green laser return beam was visible at the HWS camera, with ~50uW power. It was also quite large, and the beam shape indicated clipping.
We took an image of the beam spots with the HWS camera, and also briefly installed a CMOS camera to observe the return beam. We cannot fit the entire beam onto the camera sensor, however you can see enough to observe striations in the beam profile (see attached).
Planning to calculate what lens to put in the path to ensure the beam is correctly sized for the entire path to avoid clipping.