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Photorefractive effect generated in sillenite crystals by picosecond pulses and comparison with the quasi continuous regime

Gilles Pauliat 1 Gérald Roosen 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Photorefractive gratings are generated in a BSO crystal by the interference of two 25-psec pulses at 532 nm. The grating is analyzed by diffraction of a third pulse or a weak cw argon laser, which permits a continuous monitoring of its evolution from picoseconds to milliseconds. The grating builds up in two steps; their relative contributions vary strongly with fluence. This behavior is explained by means of a band transport model with shallow traps. Values of mobility, lifetimes, and diffusion lengths of carriers are derived and compared with those obtained in experiments conducted with low-power lasers; the values show a striking continuity from cw to picosecond regimes.
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Gilles Pauliat, Gérald Roosen. Photorefractive effect generated in sillenite crystals by picosecond pulses and comparison with the quasi continuous regime. Journal of the Optical Society of America B, Optical Society of America, 1990, 7 (12), pp.2259-2267. ⟨hal-00856195⟩

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