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Old 08-05-2011, 11:32 PM #1
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Default 445nm Cooling - TEC or not?

Hello everyone, Im new in this Forum, was reading for some time and now I have a question and need your help. English isnt my mother language so please excuse any bigger mistakes and dont punish me ;P.

At first, yes i have safety glasses (OD4-5) and experience with high powerd handheld lasers up to 200mW. Now i want to build a 445nm Lab Laser and am just wondering how to cool the Diode without overdoing it.

The diode is powered with 850mA to get about 1W with the 405-G1 Lens. I have a heatsink 4*4*4cm with a small 4cm fan. Now I have the Option for adding a TEC Cooling with a huge heat sink which drains about 4A at 12V. But when I see you here using this diode with much higher Power in handheld lasers Im wondering if the TEC Cooling is really necessary? I mean TEC sure is great, but it needs so much current and space, so I really want to use it only if absolutely necessary. My Target is a lab laser I can run for longer times without worrying the diode could die a crucial heat death, even though Im not planing using it for really long times.

So lets say what u think about it and help me making my decision. It would be really annoying to use such a big cooling system without really needing it.

-MadEye


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Old 08-06-2011, 01:04 AM #2
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Default Re: 445nm Cooling - TEC or not?

A TEC isn't necessary. A fan is probably good enough to run it with no duty cycle.

IF one were to use a TEC, it would be to keep the diode from over-heating, not to freeze the piss out of it (otherwise you get condensation problems). This means you would want to run much less than 4A.
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Old 08-06-2011, 01:06 AM #3
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Default Re: 445nm Cooling - TEC or not?

A large and massive heatsink should take care of your worries along with 2 small fans side by side facing it with a 45 degree angle on each side.
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Old 08-06-2011, 08:03 AM #4
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Default Re: 445nm Cooling - TEC or not?

^ I like the fact that you know that massive means has lots of mass and not just "huge, dawg!"
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Old 08-06-2011, 02:28 PM #5
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Default Re: 445nm Cooling - TEC or not?

What is the full square of heatsink?
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Old 08-06-2011, 02:46 PM #6
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Default Re: 445nm Cooling - TEC or not?

Depending on the form factor you want, a radial CPU heatsink would probably be the easiest thing in most regards. I think the one I did was a cheap one for socket 775.



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Old 08-06-2011, 06:07 PM #7
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Default Re: 445nm Cooling - TEC or not?

Where does everyone find these radial CPU heatsinks?! Any computers I disassemble always have square CPU heatsinks.
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Old 08-06-2011, 06:15 PM #8
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Default Re: 445nm Cooling - TEC or not?

Simple. I don't rely on junking out computers to find them, I bought them new. heh. They were only like $6 but I think they're getting hard to find now. I have about a dozen in a box somewhere that I planned to modify and sell but Haven't had a chance to get around to it yet.

There is a copper radial P3 heatsink that's actually much more optimal size wise, but they're even harder to find. I only found one surplus seller with them and he was asking /way/ too much.. (I think it was like $40/each or something stupid like that)
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Old 08-06-2011, 07:04 PM #9
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Default Re: 445nm Cooling - TEC or not?

Oh. I see!
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Old 08-06-2011, 07:47 PM #10
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Default Re: 445nm Cooling - TEC or not?

Hey! Thanks for all your answers, you helped me a lot.

I finaly made a testrun of the 1W Laser using just my small heatsink with fan and after 5 minutes it wasnt even warm. Im planing to mount everything on a bigger plate of aluminium to get more cooling and a better stand, think this should work well. Next step is anodizing all this aluminium parts black...

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Old 08-10-2011, 04:49 AM #11
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Default Re: 445nm Cooling - TEC or not?

Well we all hope to see some photos soon of your work , becarefull with static electricity and good luck

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