针对中波红外激光器输出功率波动较大，采用声光反馈调节的方法，研发出一套声光反馈调节中波红外激光器腔体外功率的稳定控制系统，系统主要由声光调制器、探测器、微电流放大器、反馈控制电路等组成。经实验验证，该系统有效地抑制了激光器输出功率的波动，波动可控制在±0.08%范围之内，达到了低温绝对辐射计对输入激光稳定性的要求。同时该系统具有软件调节输出功率的功能，能够便捷、低成本地实现激光器多种不同功率的连续可调性输出，通过增量式PID算法使得系统在2s内便可完成不同功率之间的调节，亦解决了以往一台激光器只有唯一的输出功率的局限问题，满足用户的多种使用需求，具有实用性、创新性。

To suppress the fluctuation of medium wave infrared laser output power, a kind of power stabilization system was developed by the method of acousto-optic feedback, which consists of acousto-optic modulator, detector, micro-current amplifier and feedback control circuit. According to the experimental results, this system has the ability to suppress the power fluctuation in the range of ± 0.08% and to meet the stable output power requirement of cryogenic radiometer. Different mode can be set easily in software to obtain the different output power of the laser, and the adjust progress will be finished within 2 s by using the incremental PID control algorithm. This function gives users great convenience and solves the problem that one laser can only supply one output power. This system has the advantage of good practicability and innovation.