Spatial coherence research and passive speckle suppression for edge-emitting broad-area semiconductor lasers

IF 2 4区物理与天体物理 Q3 OPTICS

Journal of Optics Pub Date : 2024-03-11 DOI:10.1088/2040-8986/ad2a21

Ao Chen, WeiQiao Zhang, XuYan Zhou, Jing Liu, WanHua Zheng

引用次数: 0

Abstract

The spatial coherence of filaments in edge-emitting broad-area semiconductor lasers (BALs) is studied based on speckle theory, and a passive speckle suppression method for BALs is demonstrated. A fly-eye lens is used to integrate the filaments and homogenize the laser beam. The speckle contrast is consistent with theoretical calculation, which proves the spatial incoherence of filaments. A light pipe is used to introduce an optical path difference between light with different incident angles, enabling more incoherent beamlets. These beamlets are then combined at different illuminating angles by a double-sided fly-eye lens and focusing lens. As a result, the subjective speckle contrast is reduced from 95.94% to 19.13% at 1.2 A while maintaining a high luminous efficiency of 77.8%. This work provides important design principles for laser display systems.

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边缘发射广域半导体激光器的空间相干性研究和被动斑点抑制

基于斑点理论研究了边缘发射宽域半导体激光器（BAL）中灯丝的空间相干性，并展示了一种用于 BAL 的被动斑点抑制方法。使用飞眼透镜整合灯丝并均匀激光束。斑点对比度与理论计算一致，证明了灯丝的空间不一致性。光导管用于在不同入射角的光线之间引入光路差，从而产生更多的不连贯小光束。然后，这些小光束通过双面飞眼透镜和聚焦透镜在不同的照明角度下进行组合。因此，在 1.2 A 时，主观斑点对比度从 95.94% 降至 19.13%，同时保持了 77.8% 的高光效。这项工作为激光显示系统提供了重要的设计原则。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Optics OPTICS-

CiteScore

4.50

自引率

4.80%

发文量

237

审稿时长

1.9 months

期刊介绍： Journal of Optics publishes new experimental and theoretical research across all areas of pure and applied optics, both modern and classical. Research areas are categorised as: Nanophotonics and plasmonics Metamaterials and structured photonic materials Quantum photonics Biophotonics Light-matter interactions Nonlinear and ultrafast optics Propagation, diffraction and scattering Optical communication Integrated optics Photovoltaics and energy harvesting We discourage incremental advances, purely numerical simulations without any validation, or research without a strong optics advance, e.g. computer algorithms applied to optical and imaging processes, equipment designs or material fabrication.