外腔锁相中二极管激光阵列发光单元间耦合系数分析

Analyzing the coupling coefficients between emitters of a diode laser array phase locked in an external cavity

推导了外腔中二极管激光阵列各发光单元之间的耦合系数,结果表明:增加外腔长度有利于减小各阶耦合系数的差别和实现"并联耦合",但是外腔的作用效果下降;降低阵列前端面的反射系数,有利于实现外腔锁相;外腔锁相中并联耦合的单元数越多,激光二极管阵列前端面的反射系数的允许值越小。

Expressions describing couplings between different emitters of a diode laser array (DLA), positioned in an external cavity (EC), have been deduced. The results show that: the increase of the EC length reduce the differences between these coupling coefficients, which is favorable to achieve the parallel coupling at the expense of the effectiveness of the EC; decreasing the reflection coefficient at the front facet of the DLA is favorable to achieve phase locking in EC; the more parallelly coupled the emitters arc, the lower the allowed reflection coefficient at the front facet of the DLA is.