半导体激光线阵(LDB)在制作和封装过程中会发生弯曲,从而引起发光弯曲,即“smile”,这影响其在抽运固体激光和外腔半导体激光阵列线宽窄化中的使用。利用平凸柱面镜在一定程度上可矫正半导体激光线阵的“smile”。通过几何光学方法对平凸柱面镜矫正半导体激光线阵的“smile”进行理论分析,利用不同焦距平凸柱面镜对不同半导体激光线阵的“smile”进行矫正,并通过ORIGIN软件对“smile”的矫正进行模拟,其结果与实验相吻合。结果显示,抛物线状“smile”矫正效果很好,相对矫正量高达90%,选择合适小焦距平凸柱面镜对“smile”矫正较明显且模拟误差小,修正透镜焦距参数可减小误差。

Laser diode bar (LDB) curvature, namely “smile” produced in the manufacturing and packaging process, affects the application of LDB in laser diode pumped solid-state laser and external cavity laser diode array. Using plano-convex cylindrical lens, “smile” can be corrected to some extent. By geometrical optics approach and ORIGIN software, “smile” correction was simulated and coincided with the experiment. The results show that this method works best if the “smile” is a parabolic curvature, and the relative correction value can be as high as 90%. “Smile” is corrected obviously by using suitable lens with short-focal length. Moreover, error can be further reduced by amending focal length of lens.