Time resolved measurements of gratings photo-induced by femtosecond pulses in a lead doped glass
Langue
en
Article de revue
Ce document a été publié dans
Optical Materials Express. 2012-12-01, vol. 2, n° 12, p. 1751-1759
OSA pub
Résumé en anglais
We report on the formation of gratings photo-induced by femtosecond laser pulses in SF59 glass. Depending on the number of pulses used to excite the sample and the pump power density, transient or permanent gratings are ...Lire la suite >
We report on the formation of gratings photo-induced by femtosecond laser pulses in SF59 glass. Depending on the number of pulses used to excite the sample and the pump power density, transient or permanent gratings are induced. We demonstrate that the grating formation is not instantaneous and is produced by laser-induced defects. This results in a change of both the real and imaginary part of the index of refraction. A simple set-up that records the temporal evolution of both parameters during the laser excitation is also presented. It makes it possible to evaluate the weight of both contributions to the grating diffraction efficiency.< Réduire
Mots clés en anglais
(140.3390) Laser materials processing
(140.3440) Laser-induced breakdown
(320.7130) Ultrafast processes in condensed matter
including semiconductors
(160.2750) Glass and other amorphous materials
(320.2250) Femtosecond phenomena
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