二极管泵浦1064nm单频Nd∶YAG激光器输出功率稳定控制系统设计  

Control system for stabilizing output power of diode-pumped single-frequency Nd∶YAG laser at 1064 nm

作　　者：郑毅[1] 邢俊红[1] 焦明星[1] 王为梁[1] 

机构地区：[1]西安理工大学机械与精密仪器工程学院精密仪器系,陕西西安710048

出　　处：《应用光学》2011年第4期791-796,共6页Journal of Applied Optics

基　　金：国家自然科学基金(50775180);西安市科技计划(CXY08009)

摘　　要：介绍了激光二极管(LD)端面泵浦1 064 nm单频Nd∶YAG激光器的工作原理和结构特点,分析了影响这种固体激光器输出功率稳定性的主要因素,设计并实验研究了一种用于稳定该激光器输出功率的控制方案。该方案在严格控制LD和Nd∶YAG晶体工作温度的条件下,当单频Nd∶YAG激光器的输出功率波动时,根据LD输出功率与其注入电流成正比这一变化规律,利用获得的功率误差信号反馈控制LD的注入电流,即可稳定单频Nd∶YAG激光器的输出功率。实验结果表明:当LD泵浦1 064 nm单频Nd∶YAG激光器的输出功率约为11.5 mW时,采用所设计的控制系统,可使激光输出功率稳定性在130 min内优于1.3%。The stability of laser output power is one of the important parameters to evaluate the laser performance.This paper introduced the operation principle and the structural features of a laser-diode（LD） end-pumped single-frequency Nd ∶ YAG laser at 1 064 nm,analyzed the main factors that affected the stability of the Nd ∶ YAG laser output power,proposed and experimentally studied a control scheme for stabilizing the Nd ∶ YAG laser output power.Since the output power of the Nd ∶ YAG laser was proportional to the LD＇s injection current when the temperature of the LD and the Nd ∶ YAG crystal rod was stable,the control scheme strictly controlled the temperature of the LD and the Nd ∶ YAG crystal rod,and the LD＇s injection current was adjusted through a negative feedback control system when the Nd ∶ YAG laser output power fluctuated.The experimental results indicated that when the output power of the LD-pumped single-frequency Nd ∶ YAG laser at 1 064 nm was about 11.5 mW,the laser output power stability was better than 1.3% within 130 min using the designed control system.

关 键 词：功率稳定性 单频激光器 Nd∶YAG晶体 反馈控制 ADuC848微处理器 

分 类 号：TN249[电子电信—物理电子学]