TEC'ing for wavelength shifts?

bloompyle · Mar 24, 2012

Now, I've done a little bit of reading, and have read of a little technique using TEC's for cooling a diode down for shifts in WL. Specifically, 0.3nm per 1 degree Kelvin. That being said, how much more money (outside of the peltier cost) goes into such a build? Is that ratio more or less accurate? Can said technique lead to 645nm? 625 perhaps? 435? If such a process is possibly feasible, then I plan to definitely look into it further. I don't expect such a built to be portable, but I like the labby look, so that's all dandy in my book. Thanks for any and all help/build tips, have a great night =]

kiyoukan · Mar 24, 2012

Well lets have some fun here.
Each diode has a spec sheet, in there you will find the NM shift at different temps.
For some diode the cooling will make the beam brighter and some will make it less.
Price depends on the driver you use.
To drive the tec you could just use constant current with no feedback, that would be the cheapest.
You could build a cheap tec driver out of a pwm 555 ic using a thermistor to change the pwm. Still very cheap and works very well.
Buy a tec driver, there are several.
You could use a pc fan controller and hook that up to a pwm driver, or some of them are able to drive high powered fans or TECS.
So you can make a cheap driver diy and keep the cost down or you can buy one and the price will be around 20 to 45$.
And you also need a fan to keep the warm side cool.
You can wire this to be constant on or build another driver that monitors temp and increases the speed of the fan per temp.
So there are several options.
You could not need a fan by having the hot side into the baseplate.
What do you want this to do with this lab build? projector or just long run fun laser?

bloompyle · Mar 24, 2012

That's a lot to research in morning (calling it a night now~ish) as far as the package size/type, I don't care how large it is, just trying to expand my wavelength collection. So labby, if it's an easier/cheaper build, and an answer to your question, just a fun long rubbing build in a different wavelength.

kiyoukan said:
Well lets have some fun here.
Each diode has a spec sheet, in there you will find the NM shift at different temps.
For some diode the cooling will make the beam brighter and some will make it less.
Price depends on the driver you use.
To drive the tec you could just use constant current with no feedback, that would be the cheapest.
You could build a cheap tec driver out of a pwm 555 ic using a thermistor to change the pwm. Still very cheap and works very well.
Buy a tec driver, there are several.
You could use a pc fan controller and hook that up to a pwm driver, or some of them are able to drive high powered fans or TECS.
So you can make a cheap driver diy and keep the cost down or you can buy one and the price will be around 20 to 45$.
And you also need a fan to keep the warm side cool.
You can wire this to be constant on or build another driver that monitors temp and increases the speed of the fan per temp.
So there are several options.
You could not need a fan by having the hot side into the baseplate.
What do you want this to do with this lab build? projector or just long run fun laser?

kiyoukan · Mar 24, 2012

for the most part the nm shifts are small. only the old 445nm and the new 635nm diodes seem to have very large shifts in nm and still i think they are limited to around 5nm max

bloompyle · Mar 24, 2012

Well that's going to put a damper on my high wavelength build (with 445from rhd) and my high wavelength 12X. However 5nm still offers variety, so it's better than nothing

thanks for all the help! Thank being said, he did gurrantee me a high WL 445 for a fee, and he did make a 455 build, so I'm still a bit optimistic =]

TEC'ing for wavelength shifts?

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