Ultrafast photorefractive effects

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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