The frequency dependences of both amplitude and phase-shift of the first harmonic of the ring-down signal are measured by a lock-in amplifier in a phase-shift cavity ring-down technique (PS-CRD).

• 分析了相移光腔衰荡技术中由锁相放大器探测光腔输出信号一次谐波的振幅和相位随调制频率的变化曲线。