非平面环形激光器的大范围调谐技术研究

Study on high-range frequency tuning technology for nonplanar ring laser

为了实现窄线宽非平面环形Nd∶YAG激光器的大范围压电和温度调谐,采用对粘接在激光晶体上的薄压电陶瓷片施加高压驱动信号,并大范围控制激光晶体温度的方法,获得压电调谐范围达到210MHz,调谐带宽大于90kHz,压电调谐系数大于1MHz/V;当控制激光晶体温度在10℃到47℃范围内变化时,输出激光在8GHz范围内可连续调谐,总的调谐范围达到61GHz。结果表明,高频压电调谐时拍频展宽形状发生改变的主要原因是压电驱动信号失真。结合压电调谐和温度调谐的各自优点,激光频率调谐实验取得了良好效果。

In order to realize high-range piezoelectric（PZT） frequency tuning and temperature frequency tuning of a narrow line width Nd： YAG nonplanar ring laser, applying high voltage modulation signals on a thin PZT affixed to a monolithic laser crystal and changing the temperature of the laser crystal on a large scale, the tuning range is up to 210MHz, the response bandwidth is larger than 90kHz and the PZT tuning coefficient is more than 1MHz/V. When the temperature of the laser crystal is changed from 10~C to 47~C, the laser frequency can be tuned continuously by 8GHz between the mode-hops covering an overall frequency tuning range of 61GHz. The experimental results show that the distortion of the beat signal in high frequency tuning is caused by the distortion of the PZT driving signal. With the advantages of PZT tuning and temperature tuning, good results of