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Laser Speckle Suppression by the Phase Modulation of Input Beam in a Multimode Fiber
Cong Yang; Jian Han; Yuanjie Wu; Huiqi Ye; Dong Xiao
2014-07-18
Source PublicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Volume9151
PagesVol.9151 4U-1-8
Conference Date2014-6-22
Conference PlaceMontréal, Quebec, Canada
Funding OrganizationSPIE
PublisherSPIE
Abstract
When a multimode fiber transmits a laser beam, the speckle will form in its output field. A dynamic fiber scrambler could be used to suppress the speckle. No matter what actual way of suppressing speckle is, such as fiber scrambling or using a rotating phase plate, the suppression is the result of exerting disturbance in the process of the speckle forming. We could disturb the phase of the input beam with specific method to weaken the speckle effect. To get a speckle image formed by a multimode fiber, we simulate different diffraction patterns under different phase conditions using diffraction model, in which the phase of the input beam is modulated by a rough surface, and then sum them to form the instantaneous speckle. To study the speckle suppression, we superpose instantaneous speckles, and as a consequence the final speckle is suppressed. The simulation would help us understand the speckle suppression experiment with the input
beam phase modulation conducted in our lab.
KeywordMultimode Fiber Speckle Suppression Phase Modulation Simulation
Subject Area天文技术与方法
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/800
Collection中国科学院南京天文光学技术研究所_会议论文
中科院天文光学技术重点实验室_会议论文
Recommended Citation
GB/T 7714
Cong Yang,Jian Han,Yuanjie Wu,et al. Laser Speckle Suppression by the Phase Modulation of Input Beam in a Multimode Fiber[C]:SPIE,2014:Vol.9151 4U-1-8.
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