相干长度可连续调谐的半导体激光器

Coherence length tunable semiconductor laser

实验利用光反馈的方法获得了相干长度连续可调的半导体激光光源.通过调节反馈强度及抽运电流,有效控制了光反馈半导体激光器的相干长度.其相干长度可由无反馈时的几米连续调至100μm.同时,利用光反馈半导体激光器速率方程,数值模拟了反馈强度及抽运电流对半导体激光器相干长度的影响.实验及数值模拟均表明:通过调节反馈强度的大小可以有效控制半导体激光器的相干长度,光反馈半导体激光器的相干长度随反馈强度的增大而减小,而偏置电流对相干长度无明显影响.模拟结果与实验结果符合.

We report a technique for continuous tuning the coherence length of semiconductor laser. The coherence length of the semiconductor laser is controlled by using optical feedback scheme. The results show that the coherence length of semiconductor laser can be shortened from several meters of the original solitary laser to 100 μm by the implementation of optical feedback. Experimental results indicate that the coherence length of the laser depends strongly on the feedback strength, but is insensitive to the bias current. The results of numerical simulations using rate equation of semiconductor laser are fully consistent with our experimental results.