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- W4321263699 abstract "Following Valley’s work, 1 the theoretical expression for the space-charge field’s ( E sc ) buildup is derived for both cw and picosecond-pulsed low-irradiance excitation, I ≫ I sat , where I sat is the intensity at which the number of excited charges saturates. The cw and picosecond-pulsed expressions for the time-dependent E sc both reduce to where m is the modulation index of the grating and τ di is the dielectric relaxation time. An explanation of how saturation affects the growth of the space-charge field for cw vs picosecond- pulsed excitation is presented. The differential equation for the space-charge field’s time dependence is solved numerically and compared to the quasi-cw result. Theoretically, saturation effects become noticeable for an input intensity of 10 −3 I sat . For 10 kW/cm 2 peak intensity, 22.6-ps pulses, no evidence of saturation is observed experimentally for cerium-doped Sr 0 6 Ba 0 4Nb 2 O 6 (SBN). The rise times are com parable for pulsed and cw inputs of the same average intensity, over a range of average intensities. This provides a lower limit on the saturation intensity of 10 MW/cm 2 . An SPPC signal is observed in rhodium-doped SBN in the first 150 pulses (3.69-ps pulsewidth) of illumination yielding an early grating formation time of no longer than 554 ps." @default.
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- W4321263699 date "1991-01-01" @default.
- W4321263699 modified "2023-09-24" @default.
- W4321263699 title "Measurements of photorefractive response times with low-irradiance picosecond and cw light sources" @default.
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- W4321263699 doi "https://doi.org/10.1364/oam.1991.mu2" @default.
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