Electrical – Laser Diodes to work it in high temperature

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The power of laser diodes, made of GaAs, is limited by its power loss and the maximum operating temperature. Theoretically, the semiconductor material itself can be operated up to an intrinsic temperature of 650°C. Practically the operating temperature is limited at 250°C, because the electrical contacts, made by soldering with a high lead solder (300°C melting temperature).
the question is how can make or let this component to work with high temperature is that by electrical contacts in attaches in a circuit?
That's which allow an application with a maximum of operating temperature and of course i have to consider to and ensure the thermal expansion and the mechanical stability.

Best Answer

Several things:

The power of a laser diode may be limited by the light intensity causing damage to the facets, independently of the thermal effects. The datasheet should tell you both the maximum instantaneous (optically limited) power and the maximum average (thermally limited) power.

Attempting to run more current through the diode may not be effective because at a certain point you may run out of charge carriers. At higher voltages the charge carriers may also be pulled out of the active region so they are not in a good location to lase. (I am guessing here.)

Also, if your device is not designed to operate at high temperatures, it may not act properly due to the number of holes and electrons popped out of the Fermi sea by thermal effects: the free carriers act metalish instead of semiconductorish and just conduct without providing any light. Even at more conventional temperatures, laser diode efficiency drops significantly just going from 20C to 50C.

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