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projects:optics:log [2026/01/18 18:15] – [Lab Notes for Optics Experiments] rahixprojects:optics:log [2026/01/18 18:47] (current) – [Day 2026-01-18 (k8ik, rahix)] rahix
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 ==== Day 2026-01-18 (k8ik, rahix) ==== ==== Day 2026-01-18 (k8ik, rahix) ====
-Built up two more mirror mounts and a special mount for the [[projects:stm|STM]] head.+Built up two more mirror mounts and a special mount for the [[projects:stm|STM]] head (we want to measure piezo displacement). 
 + 
 +Placed the camera into the interferometer to take a look at the interference pattern digitally.  Hello world: 
 + 
 +{{:projects:optics:interference-2026-01-18_19-21.png?400|}} 
 + 
 +  * The pattern is again very very stable after tuning the diode "current" (actually the voltage). 
 +  * Did record some footage of the pattern idling. you can see room vibrations to some degree. and from time to time the mode seems to jump or get chaotic. 
 +  * Assuming we can work with this for first measurements. 
 + 
 +Here is the current setup of the interferometer. Optics in a euro container is turning out very nice :) 
 + 
 +{{:projects:optics:interferometer-setup-basic_20260118_154518363.jpg?600|}} 
 + 
 +And here is an annotated version: 
 + 
 +{{:projects:optics:explained-interferometer-2026-01-18_19-39.png?600|}} 
 + 
 +  * Red arrows are the beam path 
 +  * **1**: Laser diode 
 +  * **2**: Beam splitter cube (non-polarizing) 
 +  * **3**: First leg mirror 
 +  * **4**: Second leg mirror 
 +  * **5**: Redirection mirror 
 +  * **6**: Camera (bare sensor, without any lens) 
 + 
 +Started setting up the STM head optics mount: 
 + 
 +{{:projects:optics:stm-head-mount_20260118_172222024.jpg?600|}} 
 + 
 +We glued a tiny (10mm) jewelry mirror to the head.  It's not a first surface mirror but we get clean interference patterns anyway.  The mirror is not perfectly aligned with the piezo axis.  We will have to see if this is going to become a problem. 
 + 
 +"Experimented" with innovative cleaning agents: [[https://social.fa-fo.de/@fafo/115917130152651864]]
 ==== Day 2026-01-11 (k8ik, rahix) ==== ==== Day 2026-01-11 (k8ik, rahix) ====
 Started setting up a basic michelson interferometer to get a feel for the current system. Started setting up a basic michelson interferometer to get a feel for the current system.