Effect of high-frequency current modulation on speckle suppression in semiconductor lasers

IF 3.5 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2024-11-06 DOI:10.1016/j.optlaseng.2024.108677

Lihua Dong , Dabo Guo , Guang Yuan

引用次数: 0

Abstract

This paper describes a novel solution for speckle suppression based on high-frequency current driving, wherein the current alternates between threshold and rated levels. The speckle suppression effect achieved through spectral broadening and current pulse modulation was analyzed. The experiment on high-frequency current-driven laser speckle suppression was subsequently conducted using two different types of projection screens. Theoretical and experimental data indicate that the weights of the independent speckle mode superposition and high-frequency spectrum broadening vary with the modulation frequency. As the frequency increases, spectral broadening assumes a more prominent role, while stronger reduction in speckle contrast. This new approach offers a promising solution for improved reduction of speckle in compact projection devices.

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高频电流调制对半导体激光器斑点抑制的影响

本文介绍了一种基于高频电流驱动的斑点抑制新方案，其中电流在阈值和额定值之间交替变化。分析了通过光谱展宽和电流脉冲调制实现的斑点抑制效果。随后，使用两种不同类型的投影屏幕进行了高频电流驱动激光斑点抑制实验。理论和实验数据表明，独立斑点模式叠加和高频光谱展宽的权重随调制频率的变化而变化。随着频率的增加，频谱展宽的作用更加突出，同时斑点对比度的降低也更加明显。这种新方法为改善紧凑型投影设备中的斑点减少效果提供了一种很有前景的解决方案。

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

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques