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Applied Physics B

Multiline coherent oscillation in photorefractive crystals with two species of movable carriers

Alexander N. Shumelyuk, S. Odoulov, George A. Brost

Published May 1, 1999• 24 citations
Publisher
DOI
10.1007/s003400050730

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The four-wave-mixing coherent optical oscillator is described, which is emitting light wave with regular alternation of its phase between two discrete values zero and $\ensuremath{\pi}$. Such a periodic self-modulation is a consequence of competition of photorefractive gratings formed by movable charge species of two different signs. The period of modulation depends on overthreshold coupling strength and on decay time of slow photorefractive grating. It falls to few seconds range for Sn2P2S6{\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{\mathrm{S}}_{6}Sn2​P2​S6​ crystals at ambient temperature but it can go down to microsecond range for photorefractive semiconductors.
Periodic anharmonic modulation of output intensity is studied for semilinear coherent oscillator with photorefractive crystal that possesses two types of movable charge carriers. The pulse amplitude and modulation frequency are shown to depend considerably on grating spacing of photorefractive grating. We calculate these dependences within the model proposed earlier [A. Shumelyuk, A. Hryhoraschuk, S. Odoulov, Phys Rev. A, 72, 023819 (2005)] and show satisfactory agreement with the experimental data.