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Fiber and integrated optics
Efficiency of nonstationary transformation of the spatial coherence of pulsed laser radiation in a multimode optical fibre upon self-phase modulation
M. A. Kitsaka, A. I. Kitsakb a Boston University, Department of Physics, USA
b B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk
Abstract:
The model scheme of the nonlinear mechanism of transformation (decreasing) of the spatial coherence of a pulsed laser field in an extended multimode optical fibre upon nonstationary interaction with the fibre core is theoretically analysed. The case is considered when the spatial statistics of input radiation is caused by phase fluctuations. The analytic expression is obtained which relates the number of spatially coherent radiation modes with the spatially energy parameters on the initial radiation and fibre parameters. The efficiency of decorrelation of radiation upon excitation of the thermal and electrostriction nonlinearities in the fibre is estimated. Experimental studies are performed which revealed the basic properties of the transformation of the spatial coherence of a laser beam in a multimode fibre. The experimental results are compared with the predictions of the model of radiation transfer proposed in the paper. It is found that the spatial decorrelation of a light beam in a silica multimode fibre is mainly restricted by stimulated Raman scattering.
Received: 21.12.2006 Revised: 01.03.2007
Citation:
M. A. Kitsak, A. I. Kitsak, “Efficiency of nonstationary transformation of the spatial coherence of pulsed laser radiation in a multimode optical fibre upon self-phase modulation”, Kvantovaya Elektronika, 37:8 (2007), 770–774 [Quantum Electron., 37:8 (2007), 770–774]
Linking options:
https://www.mathnet.ru/eng/qe13506 https://www.mathnet.ru/eng/qe/v37/i8/p770
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Abstract page: | 141 | Full-text PDF : | 90 | First page: | 1 |
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