Modulation instability of broad optical beams in biased two-photon centrosymmetric photorefractive crystals

JI Xuan-mang; JIANG Qi-chang; LIU Jin-song

doi:10.3969/j.issn.1001-3806.2011.06.024

In order to obtain the modulation instability of 1-D broad optical beams in biased two-photon centrosymmetric photorefractive crystals under steady-state conditions, the growth rate of 1-D modulation instability was obtained by means of numerical simulation method after treating the space-charge field locally. The numerical results show that the maximum modulation instability growth rates increases linearly with the external electric field and spatial-frequency when the incident optical intensity is constant. When the external electric field is fixed, the maximum modulation instability growth rates increases to a maximum then decreases as the incident optical intensity increases. The modulation instability of 1-D broad optical beams depends on the external bias field and the ratio of optical beam's intensity to that of the dark irradiance.

Modulation instability of broad optical beams in biased two-photon centrosymmetric photorefractive crystals

1. Department of Physics and Electronic Engineering, Yuncheng University, Yuncheng 044000, China;

2. College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Received Date: 2011-01-05

Accepted Date: 2011-03-14

Available Online: 2011-11-25

Abstract: In order to obtain the modulation instability of 1-D broad optical beams in biased two-photon centrosymmetric photorefractive crystals under steady-state conditions, the growth rate of 1-D modulation instability was obtained by means of numerical simulation method after treating the space-charge field locally. The numerical results show that the maximum modulation instability growth rates increases linearly with the external electric field and spatial-frequency when the incident optical intensity is constant. When the external electric field is fixed, the maximum modulation instability growth rates increases to a maximum then decreases as the incident optical intensity increases. The modulation instability of 1-D broad optical beams depends on the external bias field and the ratio of optical beam's intensity to that of the dark irradiance.

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Reference (21)

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Modulation instability of broad optical beams in biased two-photon centrosymmetric photorefractive crystals

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