在不针对特定系统参量并考虑激光二极管阵列(LDA)前端面的剩余反射的情况下,对外腔锁相激光二极管阵列进行了一般性分析。在只考虑相邻发光单元间互相耦合及单元自耦合的近似下,把耦合参量表示为模和幅角的形式以便于分析各阶超模的阈值条件。对于和前端面的剩余反射系数有关的外腔锁相激光二极管阵列各阶超模的阈值,解析证明了阈值最低的模式或为最低阶超模,或为最高阶超模。说明了存在一些分立的外腔长度范围可以使激光二极管阵列运行于最低阶超模或者最高阶超模,这些结果和模式耦合理论的结果一致。

Without referring to specific devices, a universal discussion has been made on the high power laser diode arrays (LDAs) phase locked with external cavities (ECs). For a phase locked LDA based on the diffraction coupling between the nearest neighbor emitters, the coupling parameters have been expressed by module and argument, and the threshold conditions for different supermodes are analyzed, including the finite reflection of the front facet of the LDA facing the EC. Even though the thresholds of the super modes of LDA are affected by the residual reflection at the front facet, it can still be analytically proved that the favored mode of the LDA is either the lowest or highest order super mode. There exist some isolated EC lengths favoring the lowest order or highest order super modes, which are in consistent with the mode coupling theory.