为了改善传统的半导体激光器温度控制系统体积大、噪音大且精度有限等缺点，研制开发了一种基于MSP430F449单片机与DS18B20数字温度传感器的半导体激光器温控系统。结合PID控制算法，利用PWM脉宽调制，控制热电制冷器的驱动电流，实现对激光器的恒温控制。实验表明，该系统温控精度优于±0.1°C ，能够为半导体激光器提供稳定的温度环境。

To overcome the shortcomings such as big volume, big noise and limited control precision of the traditional temperature control system of the semiconductor laser, a temperature control system of the semiconductor laser is developed based on the MSP430F449 single chip and DS18B20 digital temperature sensor. In the system, the drive current is controlled by using PWM pulse width modulation and combining with PID algorithm, so the constant temperature of the laser is controlled. The experiment results show that the temperature control precision of the system is better than ±0.1 ℃, and steady temperature condition can be offered for the semiconductor laser.