Old 06-25-2010, 01:20 PM #1
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Default Prism pair on ebay

Just incase this hasn't been posted yet:
Anamorphic Laser diode Beam Shaping Prisms W/Lens 445nm - eBay (item 330445601925 end time Jul-23-10 05:39:06 PDT)

This will correct the multimode beam into a more round beam with less divergence.


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Old 06-25-2010, 01:54 PM #2
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Question Re: Prism pair on ebay

Just wondering ..... from the auction:

Quote:
These prisms were used with a 808nm laser diode. All the lenses have an AR coating. These are very useful at other wavelengths like the 445 nm,
I'm wondering how much loss this can cause ..... after all, is matter of at least 8 AR coating layers not made originally for 445nm .....
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Old 06-25-2010, 02:24 PM #3
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Default Re: Prism pair on ebay

The loss for 445nm is ~20%, I read that somewhere, but the location escapes me. These are from the 473nm CNI rebranded B&W Tek lab modules from eBay.
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Old 06-25-2010, 02:35 PM #4
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Default Re: Prism pair on ebay

Quote:
Originally Posted by Prototype View Post
The loss for 445nm is ~20%, I read that somewhere, but the location escapes me. These are from the 473nm CNI rebranded B&W Tek lab modules from eBay.
I hope you don't mean for each element ..... otherwise, the total loss (prisms and lenses) can be around 59% ..... and the loss of the prisms only can be around 36% .....
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Old 06-25-2010, 02:44 PM #5
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Default Re: Prism pair on ebay

I think it was total loss, which is still substantial, at 1000mW you're down to 800mW before any other optics.
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Old 06-25-2010, 09:44 PM #6
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Default Re: Prism pair on ebay

most beamshots I've seen are only the central emitters, and it cuts off the rest of the output. It would be nice to be able to use more of the emitting area.
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Old 06-26-2010, 09:28 AM #7
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Default Re: Prism pair on ebay

Quote:
Originally Posted by BShanahan14rulz View Post
most beamshots I've seen are only the central emitters, and it cuts off the rest of the output. It would be nice to be able to use more of the emitting area.
uhm, no, the prisms works in a different way ..... you know that a prism can "deformate" the image, looking through it, from one axis only, if you keep it inclinated when you look through it ..... the anamorphic set works in this way ..... they don't "cut out" the sides of the oval dot / bar, they "enlarge" the slow axis until it become, more or less, large like the fast one, so the collimated spot become almost circular ..... this way .....

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Old 06-26-2010, 10:37 AM #8
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Default Re: Prism pair on ebay

^ now that makes sense, but what kind of space would that take up, would it be usable in a handheld?
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Old 06-26-2010, 10:41 AM #9
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Default Re: Prism pair on ebay

The prism pair and first and last lenses for this set are a few inches long, not very portable. Besides the crystal and diode assembly, they take up the most space in the CNI lab heads.
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Old 06-26-2010, 11:53 AM #10
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Default Re: Prism pair on ebay

Still good to know if you're building a labby.

Good work men.
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