Newton Rings related to stress birefringence?

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Merlin66
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Re: Newton Rings related to stress birefringence?

Post by Merlin66 » Thu Sep 24, 2015 1:26 am

I normally associate stress "fringing" with polarized light rather than narrowband light.
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Valery
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Re: Newton Rings related to stress birefringence?

Post by Valery » Thu Sep 24, 2015 4:42 am

Merlin66 wrote:I normally associate stress "fringing" with polarized light rather than narrowband light.
With a diagonal mirror you always have a polarized light. With Liot type filters you too, have a polarized light.


Teo,

Yes, you will get rid of these "rings" caused by stress birefringence if you will replace the window in the camera
for fine annealed window (any clear flat filter from Baader). But better to test such a glass with polarizers or with
your narrow band setup.

Valery.
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Re: Newton Rings related to stress birefringence?

Post by Merlin66 » Sat Sep 26, 2015 12:32 am

Valery,
can you provide a link to explain the observation of Newton Rings from the stress birefringence of optical glass?
I can't find any links (in optical papers) between the two.
Thanks.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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