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projects:optics:log [2026/09/27 16:47] – [Lab Notes for Optics Experiments] rahixprojects:optics:log [2026/10/03 23:41] (current) – [Day 2026-10-03 (rahix, guest)] rahix
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 > //This page is a lab notebook. It documents the work done in the lab and our thoughts, theories, and findings related to it. Everything you read here is work in progress and not final results. We believe it is best to have our lab notes out in the open, because it gives more detailed insight into what worked for us and what didn't. Of course you can also use this page to follow our progress!// > //This page is a lab notebook. It documents the work done in the lab and our thoughts, theories, and findings related to it. Everything you read here is work in progress and not final results. We believe it is best to have our lab notes out in the open, because it gives more detailed insight into what worked for us and what didn't. Of course you can also use this page to follow our progress!//
 +
 +==== Day 2026-10-03 (rahix, guest) ====
 +More attempts at alignment with the Open Micro-Manipulator. Managed to get quite consistent coupling efficiency again. Working towards automatic alignment optimization.
 +
 +For this, we pointed the collimated fiber output at the camera-branded camera. After quite a bit of fiddling with the camera, managed to get it to fixed exposure at an acceptable level (Something about using the ''Auto AWB'' feature I think??).
 +
 +Truly an experiment setup:
 +
 +{{:projects:optics:20261003_fiber-alignment-experiment-overview.jpg?400|}}
 +
 +On the camera, we never see a stable beam, it always looks extremely wobbly:
 +
 +{{:projects:optics:20261003-beam-01.png?200|}}
 +{{:projects:optics:20261003-beam-02.png?200|}}
 +{{:projects:optics:20261003-beam-03.png?200|}}
 +{{:projects:optics:20261003-beam-04.png?200|}}
 +
 +We placed the fiber output and camera on the vibration-isolated optics breadboard. A bit better, but still significant (pictures above were afterwards). We are very certain the remaining wobbles is vibration in the fiber alignment part, as you can excite it easily by hand. The missing vibration isolation is very noticeable, even floor vibrations have a visible effect. By eye, you cannot see these fast intensity fluctuations in the output intensity.
 +
 +Built a proxy server for allowing network-access to the motion controller and the measured intensity. See [[https://git.fa-fo.de/rahix/FiberCoupledLaserModule/src/commit/b50cc51a03df2bef308efaaff5ec270d6712547a/alignment/control-proxy|alignment/control-proxy]] for details.
 +
 +Started working on a tool to sweep areas around the focus region to automatically improve alignment. In a dry run, we already see the expected intensity profiles along the sweep.
 +
 +With how things are aligned in the diode case right now, we are always very close to hitting the fiber on the casing/brass rod. This makes alignment in the Z direction quite annoying.
  
 ==== Day 2026-09-27 (anuejn, rahix) ==== ==== Day 2026-09-27 (anuejn, rahix) ====