Influence of positioning errors of optical shaping components for single emitter laser diode on beam shaping effects

Abstract

Beam shaping is required for semiconductor lasers to achieve high optical fiber coupling efficiency in many applications. But the positioning errors on optics may reduce beam shaping effects, and then lead to low optical fiber coupling efficiency. In this work, the positioning errors models for the single emitter laser diode beam shaping system are established. Moreover, the relationships between the errors and the beam shaping effect of each shapers are analysed. Subsequently, the relationship between the errors and the optical fiber coupling efficiency is analysed. The result shows that position errors in the Z axis direction on the fast axis collimator have the greatest influence on the shaping effect, followed by the position errors in the Z axis direction on the converging lens, which should be strictly suppressed in actual operation. Besides, the position errors have a significant influence on the optical fiber coupling efficiency and need to be avoided.

摘要

半导体激光器在许多应用中为获得高光纤耦合效率需要进行光束整形。但光学系统若存在定位 误差将会降低光束的整形效果,以导致光纤耦合效率降低。本文建立了单发射激光器二极管光束整形 系统的定位误差模型。然后分析了个整形光器件的误差和光束整形效果的关系。还分析了误差和光纤 耦合效率的关系。结果表明,快轴准直透镜在Z 轴方向上存在位置误差对光束整形效果的影响最大, 其次是会聚透镜在Z 轴方向上的位置误差对光束整形效果的影响,这在实际操作中应严格避免。此外, 光纤存在位置误差对光纤耦合效率影响较大,也需要尽量避免。