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Questions about TEC(Peltier) component






MISTERWILLING

MISTERWILLING

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ElektroFreak said:
You shouldn't need to be too precise.. What you do is tune the TEC over a period of time that allows the diode to warm up to where you want it. Once you got the TEC tuned to this maximum temperature, it should stay that way. It will take the system a little bit to get to this point, but all lab lasers have a published warm-up time. Yours would be no different than that.
Click to expand...

Thank you sir, this method should work for my setup.
 
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nikokapo

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Why, why do people feel the need to lick ice? I've never gotten my tongue stuck on a freezer :p
 
MISTERWILLING

MISTERWILLING

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I did a bunch of searching on PL, man the info on that forum is almost 75% over my head but still a great site. Found this simple kit that would allow a constant temp to be easily set. QKits Electronic Kits: FK934, Thermostat Kit 0 - 100 C $15 seems worth it to me to just be able to set the temp and not worry about it. I will be using 2x $100 blu-ray diodes and a $125 red diode so this will hopefully help protect my diodes.
 
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razeman

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Another quick question, could I use the DDL driver to control my peltier with about 8 amps of imputs?
Wouldn't it burn the driver?
 
Meatball

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You could, but you'd need to use a different IC... the LM317 would blow up!
 
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ElektroFreak

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^You shouldn't need 8A on that peltier. A few hundred milliamps should do for most laser-related applications..
 
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razeman

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Don't think so in my opinion because I'm feeding the peltier with 1.2 amps and isn't near freeze cold.
 
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ElektroFreak

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Are you trying to freeze the laser? How big is the TEC?

When you use a TEC to cool laser diode all you need is to keep it around 25C. Not freezing or anywhere near it.
 
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razeman

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Oh, Okey... I get it now... but wouldn't be better to hav it for example at around 0 Celsius?
 
jnrpop

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im trying to get a peltier/heatsink/fan setup to around -20 C , but thats for a special type of diode, a red/orange cryogenic diode that i got from chris, i think i might just go for a dry ice box on top of a heatsink and then the module, but then i have to worry about condensation, prob why he recommends it be vac sealed...mmm things to think about!! haha
Good luck
 
daguin

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razeman said:
Oh, Okey... I get it now... but wouldn't be better to hav it for example at around 0 Celsius?
Click to expand...

"If one is good, then two must be better", eh?

Diodes are made to operate at a certain temperature and current for long life and reliable operation. These temperatures are included in the data sheet for each diode. The goal is usually a predictably (long) lifespan. Cooling it below that temperature could actually shorten the life of the diode.

That being said, we often overdrive diodes for a desired effect, usually moar power. Sometimes a diode will be overcooled to force a wavelength shift.

So usually it is NOT better to overcool a diode. Unfortunately, we rarely get a data sheet for the diodes we use. Just cool it to "room temperature" to protect from overheating from overdriving it and you are doing the best to protect the life of your diode.

Peace,
dave
 
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