基于组合模理论设计的激光二极管阵列外腔

针对激光二极管阵列提出了"组合模"概念,计算了组合模的远场分布.每个组合模在远场的空间分布呈双瓣结构.基于激光二极管阵列组合模的远场分布特征,设计了离轴外腔反馈的激光二极管阵列.运用此装置所获得激光二极管阵列的远场分布有了明显变化.与自由运转的激光二极管阵列相比,离轴外腔反馈的激光二极管阵列远场宽度减少了4.3倍.在抽运电流为16 A时,测得输出激光的功率1.82 W,这相当于相同电流下自由运转激光器输出功率的79%.组合模理论不仅可以用来指导设计一维离轴外腔反馈激光二极管阵列,而且也可以用于设计二维离轴外腔反馈激光二极管阵列.二维离轴外腔反馈激光二极管阵列可以产生高功率,高光束质量输出的激光.

External Cavity Design for Laser Diode Bar Based on Calculation of Combined Array Mode

In this paper, the concept of "combined array mode" for laser diode bar is proposed, and the far-field profile of "combined array mode" is calculated. The far-field of each combined array mode exhibits a two-lobe profile with different angular position. On the basis of the characteristic of far-field profile of combined array mode, an off-axis external cavity feedback laser diode bar is designed. By employing the setup, the far-field profile of laser diode bar is narrowed by 4.3 times compared with the free-running laser diode bar. The output power of external cavity feedback laser diode bar is about 1.82 W at the drive current of 16 A, or 79% of the radiated power of the free-running state. The theory of combined array mode cannot only be applied to design the external cavity feedback laser diode bar but also can be designed the external cavity feedback laser diode stack.