Guang-ming Chen,Hua Tao,Hui-chuan Lin,Zi-yang Chen,Ji-xiong Pu.Spectral spatial coherence of high-power multi-chip LEDs[J].Optoelectronics Letters,2012,8(6):422-425 Spectral spatial coherence of high-power multi-chip LEDs Author Name Affiliation E-mail Guang-ming Chen  College of Information Science & Engineering, Huaqiao University, Xiamen, 361021, China Fujian Institute of Education, Fuzhou, 350025, China    Hua Tao  College of Information Science & Engineering, Huaqiao University, Xiamen, 361021, China    Hui-chuan Lin  College of Information Science & Engineering, Huaqiao University, Xiamen, 361021, China    Zi-yang Chen  College of Information Science & Engineering, Huaqiao University, Xiamen, 361021, China    Ji-xiong Pu  College of Information Science & Engineering, Huaqiao University, Xiamen, 361021, China  jixiong@hqu.edu.cn  Abstract:       We investigate the spatial coherence of the light generated from high-power multi-chip red LEDs by using the van Cittert-Zernike theorem. It is theoretically demonstrated that the light generated from multi-chip LEDs evolves into partially coherent light after propagation, and the spatial coherence is increased with the increase of propagation distance. Moreover, the spatial coherence of the light is found to be closely related to the chip distribution of multi-chip LEDs. The distribution of the spatial coherence of the light is experimentally examined by Young’s double-slit interference. It is found that the experimental results are consistent with the theoretical ones. Hits: 4196 Download times: 605 View Full Text    Download reader