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Old 09-20-2007, 03:17 AM #1
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Default We need a group buy for this! *500mW red!

Check this out:

http://www.photonic-products.com/pro...y_visible.html

I emailed them for prices, I'll post them as soon as I hear back. *If they're not insanely expensive, (which they probably are, so I shouldn't get my hopes up) maybe we can get a group buy going. *Below is part of the data sheet from the .pdf on the site. *If this works out, you'll have to get to work on a driver for these beasts, Daedal *Man, I hope these diodes aren't out of everyone's price range.
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Old 09-20-2007, 03:22 AM #2
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Default Re: We need a group buy for this!  500mW red!

ohhh.. 9mm. I was thinking it was a c-mount for sure.

Might be worth a shot, but.. I got a feeling unless we are ordering in the thousands ( or millions ), they are firstly not gonna even bother, and secondly the price will be absurd.
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Old 09-20-2007, 03:28 AM #3
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Default Re: We need a group buy for this! *500mW red!

Thirdly they will be multi mode with crappy beam specs.
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Old 09-20-2007, 03:38 AM #4
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Default Re: We need a group buy for this! *500mW red!

Let's see a price

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Old 09-20-2007, 05:31 AM #5
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Default Re: We need a group buy for this!  500mW red!

... Anxiously awaiting an update... ;D

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Old 09-20-2007, 02:45 PM #6
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Default Re: We need a group buy for this! *500mW red!

As of 10:45 am Eastern, no reply about prices
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Old 09-20-2007, 03:08 PM #7
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Default Re: We need a group buy for this! *500mW red!

Sorry to be a downer here, but to restate stuff already said above, here are the problems:

- Unless you're buying many tens/hundreds of thousands at a time, the prices will be outrageous, and there's a good chance the company won't even give you the time of day.

- At that spec, the diodes are going to be multi-mode anyway, which will, to put it lightly, suck!
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Old 09-20-2007, 06:33 PM #8
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Default Re: We need a group buy for this!  500mW red!

Could be one like these... :P

http://cgi.ebay.com/Coherent-High-Po...QQcmdZViewItem

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Old 09-20-2007, 06:39 PM #9
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Default Re: We need a group buy for this!  500mW red!

You know mulitmode diodes aren't that bad, you just need to correct the profile. The link daedal posted is a good example.
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Old 09-20-2007, 06:50 PM #10
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Default Re: We need a group buy for this!  500mW red!

Can you help me out here? I tried wikiing multimode, but it is not really clear to me. Does it mean multiple frequencies, or just really bad beam geometry?
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Old 09-20-2007, 07:53 PM #11
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Default Re: We need a group buy for this!  500mW red!

single mode, means the diode emit's a dot. it's a point source.

multimode is either a line or stripe, or a series of lines or stripes.. or a series of singlemode diodes together to make a bigger output.

multimode can mean a handful of things but usually it means axial mode rather than transverse mode.

axial means the laser beam specs aren't constant, there's fluctuations so it changes, but it's microscopic. you see didoes with fast axis and slow axis sides and diffrent beam specs for the divergance and angles.

transverse means it's changing wavelengths on you. it can jump from one to another or emit all at once. this is almost always filtered. ( for bare diodes it's rare, you might have a few random spikes ) you usually see this when you pump something in a cavity, like the diffrence between blue and green lasers even though they ave the same crystals it's the difference in the filtering and cavity that makes the diffrent colors.

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Old 09-21-2007, 06:08 PM #12
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Default Re: We need a group buy for this!  500mW red!

what E said ^ :P so yeah if you do it right it would just be like a singlemode for what we use it ( bright red dot/beam) it may even have large spikes into IR (more burning) but i gotta geuss these would be damn expensive
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Old 09-23-2007, 09:26 AM #13
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Default Re: We need a group buy for this! *500mW red!

Quote:
Originally Posted by Aseras
You know mulitmode diodes aren't that bad, you just need to correct the profile. The link daedal posted is a good example.
IMO, 5mRad divergence with a 4mm diameter at aperture is pretty bad. Most of us here are used to nice 0.5-2.0mRad lasers that have <2.5mm diameters. The higher power reds, IRs, etc. with multi-mode diodes end up with horrendous beam specs that make them very poor candidates for many applications like lasershows. Unfortunately that is something you just can't correct - hence the need for DPSS or gas red in quality laser projectors.
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