Temperature Control Of Laser Diode Research Articles

Temperature control circuit design of high-precision laser diode based on type III compensation network

Since the performance of laser diodes is sensitive to ambient temperature, thermoelectric cooler temperature control circuits based on standard PID temperature compensation networks are usually designed to achieve diode constant temperature control. The thermoelectric cooler time constant and thermistor thermal time constant introduced in the temperature control system will reduce the stability margin of the system. In view of this, this paper designed a high-precision laser diode temperature control circuit based on the type III compensation network, and established the transfer function model, optimized the compensation network parameter tuning method, made the phase margin of the temperature control system reach π/8, and the long-term temperature control accuracy was better than 3 mK in the ambient temperature range of 5 to 40 °C.

A scanning temperature control system for laser diodes

A computer-adjustable laser diode temperature control system yielding +or-2 mK temperature stability is described. An integrated circuit temperature sensor and a Peltier heater/cooler are used as the basis of this arrangement. Rather than a conventional bridge, a 16-bit A/D converter is incorporated to determine the temperature to high accuracy. The system is designed primarily to generate rapid temperature scans but is also capable of maintaining a set point temperature for long periods.