Threshold conditions of a diode laser array(DLA)phase-locked in an external cavity have been obtained by using the eigenvalue of the coupled-mode matrix.

• 利用耦合矩阵本征值求得了外腔锁相二极管激光列阵的各阶超模所应满足的阈值条件 ,研究了激光器前端面剩余反射和外腔长度对各阶超模阈值增益的影响。