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We compare the two single longitudinal mode wave coupling with the two multiple longitudinal mode wave coupling in photorefractive crystals. Two single longitudinal mode wave coupling has larger exponential gain coefficient Γ and shorter writing response time τ. We attributed the difference between these two kinds of coupling to the frequency separation among multiple longitudinal modes of the coupling...
We verify theoretically the existence of dark and bright spatial solitons in photorefractive media with drift or photovoltaic mechanisms based on a wave coupling process. We show that spatial solitons in a photorefractive material with a drift dominant mechanism are independent of the intensity of light. We also show that spatial solitons in a photorefractive material with a photovoltaic mechanism...
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