{"title":"Effect of high-frequency current modulation on speckle suppression in semiconductor lasers","authors":"Lihua Dong , Dabo Guo , Guang Yuan","doi":"10.1016/j.optlaseng.2024.108677","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108677"},"PeriodicalIF":3.5000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Lasers in Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0143816624006559","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
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.
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
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