Etalon spacers thickness.

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swisswalter
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Re: Etalon spacers thickness.

Post by swisswalter »

Hi Antonello

thank you very much


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

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antonello
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Re: Etalon spacers thickness.

Post by antonello »

Hello swisswalter

Thank you.
I read this your work:
http://www.wastronomiko.com/images/ausr ... repair.pdf

Congratulations for your patience. Obviously you get more easily success sending all to Oliver Smie or buying a silica wafer with parallelism less of 10 nm. Here are two other suppliers
http://fusedsilicawafers.com/ with prices
http://www.valleydesign.com/index.htm

You can try a microscope slide of 0.2 mm thickness, cutting many small pieces (2x2 mm).
To reduce the error of parallelism, you can put many pieces in circumference between the two glass (also 20 pieces) in order to average the error (not only 3-6 pieces) ...
------------------------------------------------
I tried to play with this program

https://lightmachinery.com/optical-desi ... -designer/

(that I have already mentioned) and I have verified that the correction of lambda / 100 of the optical surfaces is required. Unfortunately, the correction lambda / 10 is NOT sufficient.
The attached charts demonstrate this: NOT is possible, unfortunately , to achieve in own house a Etalon… :cry:
Attachments
lambda-100.JPG
lambda-100.JPG (99.42 KiB) Viewed 2407 times
lambda-10.JPG
lambda-10.JPG (95.52 KiB) Viewed 2407 times


etatsolarchat

Re: Etalon spacers thickness.

Post by etatsolarchat »

In Bob's post I see they check etalons by looking at a light, anyone know exactly what light that is and what do they see by looking at it?? Thanks!


etatsolarchat

Re: Etalon spacers thickness.

Post by etatsolarchat »

Nevermind, it's just a hydrogen light, will have to get one..


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