![]() Simulation results indicate that the spatial coherence length of the LED light field can reach tens to hundreds of millimeters over transmission distances of several kilometers. Then, the proposed LED-GSM model is utilized to investigate the long-distance transmission characteristics of partially coherent narrow-beam LED light. The experimental results match well with the theoretical simulations of the LED-GSM model, thus validating its effectiveness. Experimental measurements of the spatial coherence length and beam spot size of LED beams at different distances are carried out using a Thorlabs LED528EHP light source. Utilizing the cross-spectral density function transmission theory for partially coherent light, this paper provides the LED-GSM model’s spatial coherence length and beam radius at different distances and designs an experiment for measuring the spatial coherence length of LED beams. This paper is based on the generalized higher-order Lambert model of LEDs and aims to construct a Gaussian-Schell model for the LED beam (LED-GSM) on the near-field source plane, with a half-power angle of no more than 10 o. However, in reality, the LED light source emits partially coherent light with a spatial coherence length on the order of microns. When analyzing the transmission characteristics of LEDs for long-distance lighting and communication applications, the light field is commonly assumed to be fully incoherent. ![]() 2Photodetection Theory and Application Laboratory, School of Physics, Xidian University, Xi’an, China.1School of Telecommunication Engineering, Xidian University, Xi’an, China.Zhifang Miao 1 Pengfei Zhang 2 Fang Lu 2 Xiang’e Han 2* Qiwei Li 2 ![]()
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