====== Picture Gallery ======
Various pictures taken at FAFO :)

==== Interferometer Experiment for measuring STM piezo displacement (2026-01-18) ====
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Laser interferometer setup ([[projects:optics:start|Optics project]]) for measuring the displacement of the piezos on our [[projects:stm|Scanning Tunneling Microscope]] (STM).

Laser diode in the back, the piezo under test is in the front, and a camera to the left to record the interference fringes.

==== Michelson Interferometer (2026-01-11) ====
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Basic michelson interferometer set up using our [[projects:optomech:start|3d-printed optomechanical components]].  To the far left, the fringe pattern is projected onto a piece of paper.
==== Pyrite under an SEM (2025-12-07) ====
{{:gallery:2025-12-07-pyrite.png?600|}}

See [[https://social.fa-fo.de/@fafo/115679126920409451]] for context.

==== Work-in-progress wet lab (2025-11-09) ====
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We managed to get our hands on some high-quality lab furniture.  This is a work-in-progress picture of the (not yet functional) wet lab at FAFO.
==== Scanning Tunneling Microscope (2025-06-15) ====
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Business end of our DIY [[projects:stm|Scanning Tunneling Microscope]] (STM). You can see the tungsten wire tip barely above a shard of DVD that we were trying to image.
==== RP2350 delidded with sandpaper (2025-03-23) ====
{{:gallery:2025-03-23-rp2350.png?600|}}

The strucures of the chip are in pretty bad shape from the sanding, but the marking and copyright year are clearly visible.

Photo was taken using our [[equipment:zeiss-dsm-962|Zeiss DSM 962]].
==== OSHW logo on a die (2024-10-10) ====
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The open source hardware (OSHW) logo photographed on a bare die using our [[equipment:jeol-t330a|JEOL JSM-T330A]].

==== Valve assembly of a JEOL JSM-T330A (2024-07-31) ====
{{:gallery:2024-07-31-valves.png?600|}}

The valve block of our [[equipment:jeol-t330a|JEOL JSM-T330A (Kenji)]].  What you're seeing:

  * The PCB on the left is the vacuum control board, sporting a Z80 microcontroller. This board is mysteriously undocumented so we largely reverse-engineered it here:
    * [[https://git.fa-fo.de/fafo/jeol-t330a/src/branch/main/modules/ph00524/ph00524.pdf|Reverse Engineered Schematic]] ([[https://git.fa-fo.de/fafo/jeol-t330a/src/branch/main/modules/ph00524|Sources]])
  * The left valve block right behind the PCB controls rough vacuum routing (vent, chamber, diffusion pump).  It has 4 positions which are checked using the light barriers on top.
  * The right valve block opens up the diffusion pump to the chamber once rough vacuum is reached.
    * For safety, there is a vacuum-driven clutch on this valve so it can only open when a rough vacuum is actually present.
  * On the right, the back side of the sample chamber is visible.
  * In front of the left valve block, two linear regulators are bolted to a metal plate.  These provide the vacuum controller board with 24V and 5V DC power.