Ultrafast photorefractive effects

Arthur L. Smirl, K. Bohnert and Thomas F. Boggess

Recent work by collaborators at Hughes Research Laboratories and North Texas State University has demonstrated the photorefractive effect in GaAs at a wavelength of 1.06 μm using 43-ps pulses and in BaTiO3 at a wavelength of 0.53 μm using 30-ps pulses.1,2 In undoped semi-insulating GaAs, beam coupling gains up to 10% were observed with fluences that ranged up to 10 mj/cm2, while in BaTiO3 beam coupling was below the detection limits but modest diffraction efficiencies were observed in a three-pulse transient grating geometry.

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