在四镜环行像散补偿腔中,使用宽带光学单向器迫使单向行波运转,使用复合石英双折射滤光片调谐波长并压窄线宽,使用单片标准具选取单纵模,实现了连续钛宝石激光器单频运转。通过电子伺服系统将输出激光的频率锁定在共焦参考腔上。在790 nm波长处,输出183 mW时,频率稳定性优于430 kHz；输出324 mW时,频率稳定性优于610 kHz,稳定时间大于1 min。

The single frequency operation of a cw Ti:sapphire laser has been realized with an astimagition compensated ring cavity of four mirrors. A wideband optical diode was placed inside the cavity to force the tarvelling wave to travel unidirectionally. An intracavity complexed birefrigent filter and an etalon were used to tune wavelength, reduce linewidth and select the single longitudinal mode. Laser frequency was locked to a confocal reference cavity through electronic servo loop. Less than 430 kHz of frequency fluctuation when output was 183 mW and less than 610 kHz of frequency fluctuation when output was 423 mW within one minute were demonstrated at the wavelength of 790 nm.