Phase conjugation via unequal amplitude multiple gratings in photorefractives: A simple shooting method for numerical solution |
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Authors: | T K Das K Singh |
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Institution: | (1) Department of Physics, Indian Institute of Technology, Delhi, 110016 New Delhi, India |
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Abstract: | We present a simple shooting method to obtain numerical solutions of the nonlinear coupled-wave equations for degenerate four-wave mixing in photorefractive crystals when four different types of the index gratings of unequal amplitudes are responsible for phase-conjugation. Our analysis includes the effects of pump depletion and absorption in the medium. Intensities of the four beams, both inside and at the output surface, are obtained as a function of four unequal coupling strengths and absorption coefficient. Intensity of the generated phase-conjugate beam is shown as a function of both the small and wide ranges of signal beam intensity. It is found that the multigrating operation with a careful choice of coupling constants and their combinations may improve the phase-conjugate wave generation. Also the presence of absorption reduces the phase-conjugate intensity more significantly when all the gratings are operative than when a single grating is allowed. Numerical results obtained from the computer calculations are presented in graphical form. |
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Keywords: | 42 65 78 20 42 40 |
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