Pengbo, Simon

Today we were struggeling hard to align the beam in the sample-area horizontal to the optical table while crossing the probe-beam.
After some hours of work fine-tuning the lenses and steering-mirror, and constant measurements with the blade, we could achieve a good alignment in the end.

Then, we started to check the power-adjustment with the motorized HWP by turning it for 45 degrees. However, we recognized that there is no beam anymore coming out of the FI, from any of its openings.... So, something must have been wrong.
Therefore, we checked the beam-path to the FI again with much lower intensity and saw that the FI became misaligned somehow.
We think that our initial strategy by using adjustable posts may not be enough for the FI...

As a strategy, I will try to find a suitable micrometer-stage for the FI tomorrow and rebuild it.