I have a small device emitting up to ~90 Watts thermal power over a surface of 2x2 square centimeters. What is the best way (both commercially and DiY) for keeping the temperature of the device constant, maybe +- 1 degree at room temperature?
I have a thermoelectric element I could use, which has a surface area of 18x10 square centimeters for the cold plate. It is capable of removing up to ~75 Watts thermal power at 0 degrees temperature difference. How efficient will it be when I put the electric device on top of it? How much will the size difference effect the efficiency of the TEC? I know that it is rated for lower thermal powers, but it can be used as intermediary solution while keeping the device at lower powers.
The device itself is a solid state laser diode, which means that even small changes in the temperature (i.e. degrees) will shift the wavelength, something I do not want (I prefer having it at ~20 degrees). The diode can emit up to 90 Watts, depending on how much output power I request, but the upper limit is 90 Watts.