半导体激光器温度调谐波长扫描技术

Low-cost and miniaturized semiconductor lasers play an important role in optical fiber-sensing system. In this paper, a design of semiconductor laser driving circuit for temperature tuning is experimentally presented. Using the ARM chip as the core controller, the design applies a thermistor to collect the temperature signal, and uses the thermoelectric cooler (TEC) to control the temperature, thus the wavelength scanning of the laser can be achieved by temperature-controlled tuning. Then the output power is collected by a photo diode (PD), and the optic power of the laser is controlled by electric current, so that the optic power can keep stable with the changing temperature. Experiments results show that the circuit can work reliably for a long time, the max temperature tuning range reaches 5 nm, and the output optical power remains stable during the whole wavelength scanning process.