Old 09-23-2011, 11:38 PM #17
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

WOW... This is pretty incredible news. Thank you for running these tests. Good to know these can be safely pushed to 1A

@DTR - I think that was IgorT... not sure though.


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Old 09-24-2011, 01:16 AM #18
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

The prisms from surplus shed came in. one has a ~14% loss at a normal angle, but at the angle needed for better beam correction, the loss is ~30%. Don't get too caught up in power though. Audiophiles don't rate speakers on power input only.

Brightness is related to power density. A 1W beam that's 30mm wide will appear more dim than a 100mW beam that's 1mW wide. A corrected beam may appear brighter that a non-corrected one, because of the reduced divergence. Even if all else was equal, theoretically, a 30% loss of power only means a ~17% loss in brightness.

I'll try to get a comparison shot of this and do some TEC tests over the weekend.
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Old 09-24-2011, 02:08 AM #19
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

^^^Any way at all to make that work in a handheld?
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Old 09-24-2011, 03:12 AM #20
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

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Originally Posted by InfinitusEquitas View Post
^^^Any way at all to make that work in a handheld?
of course! It wont be easy though. Would be much more reasonable in a labby obviously.
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Old 09-24-2011, 03:17 AM #21
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

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of course! It wont be easy though. Would be much more reasonable in a labby obviously.
I'm aware... in theory that it is, the big question is whether it's possible on at least something of a budget in a relatively small handheld.

Even with loss of power, personally I like a nice thin beam over a fat one

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Old 09-24-2011, 03:19 AM #22
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

awsome job by all- many may be needing these- I can make it happen fast if we dont delay.

Good quality EYEWARE for the new 635 diodes possible GB
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Old 09-24-2011, 04:02 AM #23
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

Thank you very much for putting this diode through the test.
This may make a nice lab style set-up with a bit of correction, TEC, and a Flexmod.
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Old 09-24-2011, 05:15 AM #24
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

just adjusted the current on my hotlight build to 1050mA using a 650-G-1 lens...heres the graph:

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Old 09-24-2011, 06:09 AM #25
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

^^^Not quite as high as I was expecting

Still very cool and class 4 though

I guess Now I start praying to the laser gods that I got a freak, and order another one to increase my chances
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Old 09-24-2011, 06:12 AM #26
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

hmmm where does it say it should be higher?
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Old 09-24-2011, 06:14 AM #27
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

Come on your pulling our leg what diode are you really using


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just adjusted the current on my hotlight build to 1050mA using a 650-G-1 lens...heres the graph:

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Old 09-24-2011, 06:16 AM #28
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

im using the Mitsubishi 635-638nm 300mW from rayfoss
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Old 09-24-2011, 06:19 AM #29
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

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hmmm where does it say it should be higher?
Somewhere in the temporal lobe of my brain, I believe in the wishful thinking nexus

Seriously though... I was expecting more. This could mean the LD's are not very consistent. Hopefully this also means more people will end up with freaks
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Old 09-24-2011, 06:23 AM #30
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

Very nice job !

And very good graphs and pics !
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Old 09-24-2011, 06:25 AM #31
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

Quote:
Originally Posted by InfinitusEquitas View Post
Somewhere in the temporal lobe of my brain, I believe in the wishful thinking nexus

Seriously though... I was expecting more. This could mean the LD's are not very consistent. Hopefully this also means more people will end up with freaks
hmmm hopefully more freaks show up in the mix then!
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Old 09-24-2011, 09:38 AM #32
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Default Re: Rayfoss/Mitsubishi 638nm 300mW laser diode

Indeed, as far as I can tell, freaks are ... what, 1 in 5 ?

Knowing DTR, he's already bought 100 pieces, and can nicely bin them. Right, DTR?

Seriously, though. It will be easy to buy a bunch, and test each individually and sell them according to their efficiency, lower grade diodes being cheaper than higher power ones. Ofcourse you can always gamble with Rayfoss or other distributors (hopefully more pop up, see if competition lowers the price a little).

Can't wait to get home to see what kind of diode did I get Boy, this is like opening an always-winning lottery ticked. Worse you can end up with is half watt of 640nm at 1A. It can only get better.
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