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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。
Aiming at the large fluctuation of the output power of the mid-wave infrared laser, a set of steady-state control system of acousto-optic feedback to regulate the out-of-cavity power of the mid-wave infrared laser was developed by adopting the method of acousto-optic feedback regulation. The system mainly consists of acoustooptic modulator, detector, Micro-current amplifier, feedback control circuit and other components. The experimental verification shows that the system can effectively suppress the fluctuation of the output power of the laser and the fluctuation can be controlled within ± 0.08%, which meets the requirement of low-temperature absolute radiometer for the input laser stability. At the same time, the system has the function of software to regulate the output power, which can realize the output of a variety of different power of the laser conveniently and at low cost. The incremental PID algorithm enables the system to adjust between different powers within 2s , But also solves the limitations of a single laser in the past only the output power to meet the user’s multiple needs, practical and innovative.