Russian Optical Flat Testing

In this video we take a look at a Russian optical flat off ebay. Buying an optical flat used is a little tricky so these are a good option for folks wanting to try this technique. We show you can produce fringes with daylight florescent lamps. We take a look at some different surfaces in the shop and discuss the patterns. We also use a Helium Monochromatic light to show the difference in fringe quality with the proper light source.
Link for more reading. https://en.wikipedia.org/wiki/Optical...

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• #optical_flat
• #russian_optics
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• #interferometry
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• #flatness_testing