The spatial coherence properties of the spontaneous emission in the one-dimensional strong random system with gain |
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| Authors: | Lina Shi Chengfang Li Xunya Jiang Peijun Yao |
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| Institution: | aDepartment of Physics, Wuhan University, Wuhan 430072, People's Republic of China;bNational Key-lab of the Functional Material, Shanghai Institute of Microsystem and Information Technology, CAS, Shanghai 200050, People's Republic of China |
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| Abstract: | By using the finite difference time domain method, the spatial coherence properties of the spontaneous emission in the one-dimensional strong random system with gain are investigated in detail. Results show that the coherence properties improve slowly with the increase of the system length at low pump rates. And at high pump rates the coherence properties obviously become better after a certain system length. While at very high pump rates it is a non-monotonic function of the system length, there exists the best coherence at a certain system length. These behaviors are explained by Lamb theory and scaling theory. Our study may be helpful to the designing of random lasers. |
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| Keywords: | Coherence Wave propagation in random media Mesoscopic structure Random laser |
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