摘要
利用混沌激光的低相干性实现了对激光散斑的有效抑制。其中,使用了激光显示中常用的激光二极管,通过光反馈扰动激光器和电混沌信号调制激光器产生了混沌激光,分别研究了光反馈系统中偏置电流、反馈强度和调制系统中偏置电流、调制幅度对散斑抑制的影响,并对两个系统的散斑抑制效果进行了对比研究。实验结果表明,通过两种方式产生的混沌激光有效地抑制了散斑噪声,其散斑对比度均可降低0.9以上,使用混沌激光可使光谱最大可展宽至4.6 nm,其相干长度从441μm降低至87μm。
We use the chaotic laser with low coherence property to achieve speckle suppression.In particular,we use laser diodes commonly used in laser display to generate chaotic laser by diodes with optical feedback perturbation and diodes with electrical chaotic signal modulation.The effects of bias current and feedback strength in the optical feedback system,and the bias current and modulation amplitude in the modulation system on speckle suppression are studied,respectively.Moreover,the speckle suppression effects of two systems are compared.The experimental results show that the chaotic laser generated by two methods effectively suppresses the speckle noise,and the speckle contrast of speckle patterns is reduced by more than 0.9,the maximum spectrum can be expanded to 4.6 nm by using chaotic laser,and the coherence length is reduced from 441 μm to 87 μm.
作者
贺培鑫
赵彤
沈振民
He Peixin;Zhao Tong;Shen Zhenmin(Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;College of Physics and Optoelectronic Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Key Laboratory for Space Laser Information Perception Technology,China Academy of Space Technology,Beijing 100094,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第7期165-173,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61705160,61705007)
山西省“1331工程”重点创新团队建设计划。
关键词
激光器
散斑抑制
混沌激光
光反馈
混沌信号调制
lasers
speckle suppression
chaotic laser
optical feedback
chaotic signal modulation
