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- W4320801222 abstract "When a hologram is recorded in a photorefractive material by two beams, one of which is periodically phase modulated (with amplitude Θ and frequency Ω ), the output signal in a two-wave mixing configuration contains two temporal harmonics with amplitudes U Ω (at Ω ) and U 2Ω; (at 2Ω) . The origin of U 2ω in the case when the drift mechanism prevails and the diffusion mechanism is negligible is associated with the phase shift Δ between the interference pattern and the holographic grating. The value of Δ is determined by tgΔ = [Illegible] where E is the external field and E q is the saturation field, E [Illegible] where N A is the trap concentration, e is the electron charge, ε is the dielectric constant, and K is the grating wave vector. It follows from [1] that U 2Ω /U Ω = J 2 (Θ) [J 2 (Θ)] -1 tg Δ , where J. and J 2 are Bessel functions. The experimental measurements of the ratio U 2ω /U ω allows one to find E[Illegible] and N A . This technique was used to measure E[Illegible] and N A in many samples of [Illegible] and [Illegible]. The values of N A were found to be of the order of 10[Illegible] cm -3 for BSC and of the order of 10[Illegible] cm -3 for BTO, consistent with the available literature data obtained by other technique." @default.
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- W4320801222 date "1998-01-01" @default.
- W4320801222 modified "2023-09-30" @default.
- W4320801222 title "A New Efficient Technique for Measurements of Trap Concentration in Photorefractive Materials" @default.
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- W4320801222 doi "https://doi.org/10.1364/cleo_europe.1998.cfe7" @default.
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