The reentered light mixes with the original light in the LD cavity and changes the output power and spectra of the laser.

• 半导体激光器的光学反馈效应会产生跳模，频率不稳定或者混沌，增加噪声，加宽谱线，一直被认为是严重影响激光光谱性质的干扰源。