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Old 10-15-2010, 01:22 PM #1
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Default Dreamlasers have beam corrective optics

Just spoke a bit with Dreamlasers about the possibility to get a hand held DPSS red laser as they have recently started to produce new red DPSS modules.

Quote:
Originally Posted by Dreamlasers
With good beam quality red laser: DPSS 656nm&660nm
They however did not want to incorporate these into hand held portable units. But instead recommended a 655nm direct diode based laser pointer with a circular beam. I asked about some details on how this was achieved and received the reply:

Quote:
Originally Posted by Dreamlasers
655nm 50mW Red Laser Water-proof Pointer
50mW SDL-655-EFLP-050
Unit Price: US$52.00

100mW SDL-655-EFLP-100
Unit Price: US$63.00

150mW SDL-655-EFLP-150
Unit Price: US$78.00

200mW SDL-655-EFLP-200
Unit Price: US$94.00

Delivery: 2 weeks ARO


For the beam, first, this LD is special custom-made single mode output, second, we deal with the beam in optics, so make the beam to circular,

If you need more info, please contact us without any hesitation.
I asked about details on these optics;

Quote:
Originally Posted by DreamLasers
About the corrective optics, it's our secret, we can't provide to you info
I am however considering ordering a 50mW for dissection and studying. Would anyone feel up to chipping in for a few bucks each for me to do this? I'll in that case ask about the price incl shipping.

Then I'd provide detailed pics taken with my Nikon D90 DSLR.

This might come in handy for our 445nm DIY builds?

Asked if we may buy the corrective optics by itself for 445nm DIY builds. Supposing they will have to be coated differently, but we will see what they think.


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Old 10-17-2010, 07:36 AM #2
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Default Re: Dreamlasers have beam corrective optics

It really isn't that hard to create a "circularish" beam with 655nm diodes. They're not multimode like 445nm diodes so they don't have the same kind of bar-profile that 445nm diodes produce. Even cheapo Aixiz lenses can make very circular beams.

I would first check if they have anything specifically for 445nm. Cylindrical corrective lenses are not hard to come by, and can be bought cheap at sites like Surplus Shed. The issue is that if they're coated, it's usually for red. If you can find 445nm or broadband AR-coated optics for a decent price, then you'll have something, but for a 655nm laser? Anyone can do that.
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Old 10-17-2010, 03:01 PM #3
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Default Re: Dreamlasers have beam corrective optics

Quote:
Originally Posted by Bionic-Badger View Post
It really isn't that hard to create a "circularish" beam with 655nm diodes. They're not multimode like 445nm diodes so they don't have the same kind of bar-profile that 445nm diodes produce. Even cheapo Aixiz lenses can make very circular beams.
Yeah. The 445nm did look worse than the 650nm output. Thanks for pointing out and explaining
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Old 10-17-2010, 03:11 PM #4
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Default Re: Dreamlasers have beam corrective optics

IF you are looking for specially coated optics for beam correction try here....


Cylindrical lenses coated for 445


Cylindrical lenses are 'go'





Anamorphic prisms coated for 445

Anamorphic prisms are go

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