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15 July 2004 Spatially periodical structures under femtosecond pulsed excitation of crystals
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Proceedings Volume 5506, Nonresonant Laser-Matter Interaction (NLMI-11); (2004)
Event: Nonresonant Laser-Matter Interaction (NLMI-11), 2003, St. Petersburg, Russian Federation
Periodical variations of the optical properties of solids are interesting for applications to optoelectronic materials. One path to the realisation of such structures could be the spatially dependent photoburning of optically active lattice defects. In this experiment, specially prepared radiation defects in A1203 are submitted to illumination by two orthogonally polarised copropagating femtosecond pulses (polarised along the ordinary and extraordinary directions). Due to their different light velocities, the two pulses overpass each other inside the material, and the local behavior of the resulting polarisation produces a spatially periodic excitation of the defects with a limited spatial extension. We measure the defect luminescence which exhibits this spatially localised periodical structure. We studied the influence of the pulse duration on the width of this periodical structure and found that it has no effect when the pulse duration is varied using the chirp induced by group velocity dispersion. On the contrary, if the pulse duration is changed by manipulating the spectrum of the radiation, one observes a linear dependence of the spatial width of the modulation with the pulse duration. Hence, it is not the pulse duration that matters, but the coherence time.
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Guillaume Petite, Evgueni F. Martinovytch, Vladimir P. Dresvianski, and Anton A. Starchenko "Spatially periodical structures under femtosecond pulsed excitation of crystals", Proc. SPIE 5506, Nonresonant Laser-Matter Interaction (NLMI-11), (15 July 2004);

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