fiber optics.

On: Thu, Jun 28, 01 10:31:49 AM

Blueeyedpop wrote:

Well, I finally graduated to a larger laser, but I am not very happy with the beam quality. It has large concentric rings, with no appearent contamination. I haven't tried to resolve this with the manufacturer ( I truly forgot who it is). So... I focused the beam to a very small point , and guide the light where I need it with a small fiber optic(sort of like in Frank's book). The thing I noticed is that my holograms have a grainy appearance. I also believe that the polarization is completely gone. It is my theory that the larger the fiber optic diameter, the less sharp my image will be. Does any one have any experience with this? What I truly find appealing is that I can do multi beam setups by focusing the beam on multiple fiber optic strands, and conveying the light where I want it. All this on a 2'x2' table.


Colin - Mon, Jul 02, 01 06:36:31 PM

Blueeyedpop, Have you made an interferometer with fiber optics?

Blueeyedpop - Tue, Jul 03, 01 10:56:56 PM

Hmmmmmmmmmmm I'll have to think of how to do that. The polarization is definately gone, and by using a larger diameter fiber, I can reduce the graininess, but my exposures are a little dark and murky,. That could be the new 658nm laser, my exposure, dev. etc.

Colin - Wed, Jul 04, 01 12:04:50 AM

I don't know enough about polorization but, could it be cicularly polorized? To make an interferometer that tests the fiber optics I think all you need to do is aim the beam at two fibers then expand their outputs with a lens and aim them at a white screen. You should get a interference pattern. better would be to use a beam splitter but I think it is unnessary in your application. Let us know if you try.

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