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Old 03-15-2013, 03:11 AM #1
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Default Osram 450 question

Just out of curiosity, has anyone tried cooling one of the osram 450nm diodes with a TEC? I've seen that the M140s, and especially the 9mm 445s, seem to get quite an efficiency boost when cooled well below room temperature (something I plan on exploiting in my next build) and I was wondering if the 450s might benefit from being chilled down as well.

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Old 03-15-2013, 03:21 AM #2
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Default Re: Osram 450 question

Double thread?

I dont think anyone has cooled that particular diode, but its stands to reason that it will help it. Diode lasers in general benefit form active cooling, while dpss lasers benefit from temperature regulation.
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Old 03-15-2013, 03:40 AM #3
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Default Re: Osram 450 question

where will the TEC hide the heat, once it's slurped away from the diode?
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Old 03-15-2013, 04:17 AM #4
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Default Re: Osram 450 question

Quote:
Originally Posted by pschlosser View Post
where will the TEC hide the heat, once it's slurped away from the diode?
I'll be using a fan cooled heat sink on the other side of the TEC.

Now, how do I delete the duplicate of this thread I accidentally created?
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Old 03-15-2013, 10:58 AM #5
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Default Re: Osram 450 question

why spend all that crap on a TEC if a big heatsing works just as good
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Old 03-15-2013, 11:24 PM #6
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Default Re: Osram 450 question

Well, if you want to get below room temperature ambient you really need TEC. Not that I know anything about 445 performance below 30c or so.

I just use the Z-bolt heat sinks and an aggressive fan.
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Old 03-16-2013, 07:21 AM #7
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Default Re: Osram 450 question

nothing changes below 30c
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Old 03-16-2013, 07:29 AM #8
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Default Re: Osram 450 question

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Originally Posted by weeba2kv View Post
nothing changes below 30c
Yes it does, just not enough to make it worthwhile in a handheld
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Old 03-17-2013, 09:49 AM #9
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Default Re: Osram 450 question

shifting a few nm and maybe 10 - 100 mW extra power , not visible for the eyes
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COHERENT INNOVA 90-5 GOD's power
MELLES GRIOT HeNe 75 mW max , 632.8 nm ( 38 mW )
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Old 03-17-2013, 12:25 PM #10
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Default Re: Osram 450 question

Will just shift closer to 445, use less mA for same output, not worth it IMO.

Red on the other hand, cool them like the ice age is back in fashion and reap the rewards.
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Old 03-18-2013, 07:41 AM #11
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Default Re: Osram 450 question

ok it's a red diode but results are the same
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Working lasers are.
400mw 532nm < dead
cute 5mw 532nm < my cat ate it
200mw 650nm < gave it away
1mw 632.8 nm HeNe
1.2-1.4watt 445nm

COHERENT INNOVA 90-5 GOD's power
MELLES GRIOT HeNe 75 mW max , 632.8 nm ( 38 mW )

Last edited by weeba2kv; 03-18-2013 at 07:42 AM.
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