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

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.

Domaines: Optique [physics.optics]

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, 1990, 7 (12), pp.2259-2267. ⟨hal-00856195⟩