Studies on cavity tuning characteristics of dual-frequency lasers can be helpful for expanding laser physics theory and sensing applications. Based on microchip Nd:YAG orthogonally polarized dual-frequency laser, several important cavity tuning characteristics of dual-frequency laser are studied, including intensity tuning, frequency difference tuning, sub resonant cavity effect and frequency difference lock-in. Experimental results and data are presented. With cavity tuning, the variation of frequency difference between two orthogonally polarized frequencies can be up to 350 kHz; when sub resonant cavities exist, the maximum variation can be up to 2 MHz; frequency difference lock-in has not been found and the minimum frequency difference is about 14 MHz.%基于微片Nd∶YAG正交偏振双频激光器,研究了若干重要的双频激光器腔调谐现象,包括光强调谐、频差调谐、子谐振腔效应及频差闭锁等,给出了实验结果和数据.腔调谐下,正交双频的频差调谐量约为350 kHz；存在子谐振腔效应时,频差调谐量最大可达到2 MHz；未发现明显频差闭锁现象,频差最小值可达到14 MHz.
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