基于空间模式的干涉,tilt-locking技术为稳定激光频率或锁定光学谐振腔提供了一种灵活便捷的方法。在本文中,对tilt-locking技术进行了修改并进行了实验演示。该方法使用非谐振的一阶空间模式TEM01模作为相位参考,并利用TEM01模式和TEM00模式的干涉进行光学腔的锁定。在光学腔的反射光路中添加障碍物以阻挡反射光束的一半。反射光束的通过的一半由单像素光电探测器而不是分离探测器来检测,以导出用于将光学腔的TEM00模式谐振频率锁定到激光频率的误差信号。利用此方法可以将光学腔稳定锁定4 h。

Based on spatial mode interference,tilt-locking technique is a flexible and convenient way to stabilize laser frequency or to lock optical cavity.In this paper a modification of tilt-locking is described and experimentally demonstrated.The method uses a non-resonant first-order spatial mode TEM01 as phase reference,and utilizes the interference of the TEM01 mode and the TEM00 mode for locking.An obstacle is added in the reflected light path of the optical cavity to block half of the reflected light beam.The passing half of reflected beam is detected by a single-pixel detector,instead of a split detector,to derive the error signal for locking TEM00mode resonant frequency of optical cavity to laser frequency.An optical cavity can be stably locked over four hours with this method.This modification makes tilt-locking technique become more convenient and flexible.