双偏振激光谐振腔能够产生两个垂直偏振的横模模式, 分别为基横模（TEM00）和具有轨道角动量的涡旋光束（LG01）, 二者在光频率上具有频差。为了研究两个横模的频率差调谐特性, 采用温度与电压相结合的调谐技术方法, 实现拍频信号在不同频率范围的连续调谐。理论计算分析了两模式频差分别与温度和电压的对应关系, 实验实现了频差的大范围可调谐性, 并对频差的调谐精度进行了测量分析。结果表明, 频差与温度和电压之间都呈现出良好的线性关系, 并得到对温度和电压的调谐斜率分别为3.14GHz/K和1.76MHz/V。该研究能够更好地分析双偏振谐振腔直接产生涡旋光束现象, 并在激光通信和激光雷达探测等技术领域具有应用价值。

Two perpendicularly polarized transverse mode modes can be generated by a bipolarized laser resonator, namely fundamental transverse mode (TEM00) and vortex beam with orbital angular momentum (LG01). There is frequency difference in optical frequency. In order to study frequency difference tuning characteristics of two transverse modes, tuning technique combining temperature and voltage was adopted. Continuous tuning of beat signal in different frequency ranges was realized. The relationship between frequency difference of two modes vs. temperature and voltage was analyzed theoretically. Experiments showed that frequency difference can be tuned in wide range. Tuning accuracy of frequency difference was measured and analyzed. The results show that, there is good linear relationship between frequency difference vs. temperature and voltage. The tuning slopes of temperature and voltage are 3.14GHz/K and 1.76MHz/V, respectively. This study can better analyze the phenomenon of vortex beam generated directly by dual polarization resonator. It has application value in the fields of laser communication and lidar detection.