Theoretical investigation of the time behavior of self-focused light pulses propagating in biased photorefractive media and experimental evidence on Bi12TiO20

Delphine Wolfersberger (1) , Nicolas Fressengeas (1) , Jean Maufoy (1) , Godefroy Kugel (1)

1 LMOPS - Laboratoire Matériaux Optiques, Photonique et Systèmes

This paper presents a theoretical and experimental investigation of the self-focusing of a laser pulse in a photorefractive medium on a nanosecond time-scale. For times shorter than the dielectric recombination time, we analyze the space-charge field build-up with respect to time and space and provide strong hints on the short time self- focusing of a narrow powerful beam. In order to validate our theoretical and numerical analysis, systematic investigations were performed on a Bi12TiO20 crystal, to show the effect of the external applied electric field, the intensity of the laser pulse and the beam waist.

Domaines: Optique [physics.optics]

Delphine Wolfersberger, Nicolas Fressengeas, Jean Maufoy, Godefroy Kugel. Theoretical investigation of the time behavior of self-focused light pulses propagating in biased photorefractive media and experimental evidence on Bi12TiO20. Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV, Jul 1998, San Diego, CA, United States. pp.102-109, ⟨10.1117/12.326847⟩. ⟨hal-00256686⟩