When a portion of light emitted from a laser source is reflected or scattered back into the laser cavity by an external target, the reflected light will mix with the light inside the cavity, causing a modulation of the laser output power. 激光自混合效应是指激光器输出的光被外部物体反射或散射后,其中一部分光又反馈回激光器的谐振腔,反馈光携带了外部物体的信息。