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Old 07-30-2010, 10:48 AM #1
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Default Anamorphic Prism Beam Correctrion Optics

I've been thinking of trying this for a few days so I want to see what you all think. The 445nm diode has different diverging coefficients for the two axis so couldn't you use anamorphic prisms to adjust the divergence of only one axis to match the second to get a round beam? This would be too hard to implement into a portable host but it'll be perfect for labbys, and especially for those of you who want to use 445nm in your scanners.

First look at this link:

Olympus FluoView Resource Center: Diode Lasers - Interactive Java Tutorial

See what I mean now?

Those anamorphic prisms can be salvaged form a B&W Tek BWB-10-OEM 10mW 473nm Labby. I know there in there because I have one.

See:


There are non-functioning units available on eBay for about 40 bucks. You'll get the lenses, a potentially nice labby host, a 2w 808nm diode (assuming it works), and a couple of TECs among other things. Seems like a good deal to me. Furthermore, since the laser is 473nm the lenses are surly AR coated for that range, they should be good for 445nm too.

NONFUNCTIONING 473 nm Blue Laser, Emits Some Light - eBay (item 220644388799 end time Aug-26-10 11:45:44 PDT)

Just a thought ...what do you think?

-Tony


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Old 07-30-2010, 11:57 AM #2
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Default Re: Anamorphic Prism Beam Correctrion Optics

CDBEAM has a Thread on using those type of prism lenses...
and on a Jayrob portable build...

445LD with Anamorphic Prisms on a Jayrob DIY


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Old 07-30-2010, 01:09 PM #3
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Default Re: Anamorphic Prism Beam Correctrion Optics

Yes, but you will never get a round beam. The best you can hope for is a square beam, unless you can clip the corners..
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Old 07-30-2010, 01:18 PM #4
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Default Re: Anamorphic Prism Beam Correctrion Optics

I think the prisms don't have the required coatings. The prisms are used to correct the beam of the pump diode. A 473nm is using the same pump wavelength like the 532nm ones --> 808nm...

But for sure it is worth a try. Just start with a few 100mWs. Measure the power before and after the prisms...

p.s. even the coating would be wrong the prisms should not reflect the beam back into the diode...
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Old 07-30-2010, 01:23 PM #5
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Default Re: Anamorphic Prism Beam Correctrion Optics

Coating would be important, because reflection depends on angle, and there are some high steep here. Single cylindrical lens which would both correct and collimate would be best. But it would have to be aligned to the diode chip.
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