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projects:optics:log [2026/07/17 17:15] – [Day 2026-07-16 (rahix, guest)] rahixprojects:optics:log [2026/07/18 12:47] (current) – [Day 2026-07-18 (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 2026-07-18 (rahix, guest) ====
 +Cases are ready:
 +
 +{{:projects:optics:2026-07-18-cases.jpg?600|}}
 +
 +==== Day 2026-07-17 (rahix, guest) ====
 +Since we do not have a FAFO laser driver design yet (see techtree [[https://git.fa-fo.de/fafo/techtree/issues/85|#85]]), we are going to use an ''LD1100'' ([[https://www.thorlabs.com/oem-laser-diode-driver-constant-power?tabName=Overview|Thorlabs]]) module. We set up the module for the diode and verified everything works:
 +
 +{{:projects:optics:20260717_diode-test.jpg?600|}}
 +
 +Selected gain for the ''LD1100'' is max I<sub>mon</sub>=260µA. The diode monitoring current is specified for 150µA typ., but up to 400µA. With the selected gain and this diode, it works out well and the diode is easily driven at about 30mA.
 +
 +Wired up the diode socket to a 3-pin dupont header. The wires are labelled with 1, 2, 3 rings for pin 1-3 of the diode. For pin code A diodes like the one we are using, this means:
 +
 +{{:projects:optics:pin-code-a-diode-description.png?nolink&600|}}
 +
 +And it lines up with the pinning of the ''LD1100'' so you can connect it directly, as visible in the picture.
 +
 +----
 +
 +In the meantime, somewhere else, we machined the case(s) for the diode modules:
 +
 +{{:projects:optics:2026-07-17-diode-module-cases.jpg?600|}}
 +
 +The CAD really doesn't do it justice how small this is!
  
 ==== Day 2026-07-16 (rahix, guest) ==== ==== Day 2026-07-16 (rahix, guest) ====