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Old Nov 10th 2013, 10:48 AM   #1
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Question Optical non reflective surface

Hello everyone

I have some optical surfaces and want to make them non reflective. The material is Aluminium and I have black anodized it ,but again there is reflects that disturbs my system.
How can I cope with this problem?

Thanks in advance
Vahab
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Old Nov 10th 2013, 12:55 PM   #2
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Originally Posted by vahab View Post
Hello everyone

I have some optical surfaces and want to make them non reflective. The material is Aluminium and I have black anodized it ,but again there is reflects that disturbs my system.
How can I cope with this problem?

Thanks in advance
Vahab
I don't know what "black anodized" means, so if what I'm suggesting is what you've already done, then please ignore this post.

You will probably want to use a surface that is rough, sandpaperish rough would likely do the trick. Another thought I just had is to coat the surface with rubber.

-Dan
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Old Nov 11th 2013, 06:49 AM   #3
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"Black anodized" is a surface prep typically used with aluminum to reduce corrosion. It is not a good choice for making something optically black (i.e. non-reflective). A better choice would be flat black paint. Also as topsquark suggested black rubber coating may be a good choice as well.
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Old Nov 12th 2013, 10:14 AM   #4
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Try posting your question on an astronomy forum,
I am sure I have seen this sort of thing come up in discussions of telescope manufacture.
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Old Nov 12th 2013, 11:13 AM   #5
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Originally Posted by MBW View Post
Try posting your question on an astronomy forum,
I am sure I have seen this sort of thing come up in discussions of telescope manufacture.
Absolutely right. Amateur astronomers will often use flat black paint on the inside of their telescope tubes to cut down on reflections and glare. Another common technique is to use black cloth.
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