Abstract: In order to achieve required stabilities of pump lasers and make laser diode work at a constant temperature, we designed a stable temperature control system and set up its theoretical model. We got an optimized con trol plan after concrete analysis. This system was cooled(warmed) by adopting TEC with two-way current. Many types of temperature sensors can be used. The PID processor and a good result have been achieved.

Key words: temperature controller, thermal electronic cooler(TE C), PID control