The observation of self-focusing and self-trapping in potassium lithium tantalate niobate (KLTN) crystals in a very-near-transition paraelectric phase without any external applied field and without any sort of artificial background illumination is reported. This behavior depends only on the temperature T of the sample and is independent on beam intensity and size. Finally, the effect of background illumination in KLTN is studied using a y polarized uniform beam of the same intensity as the focused beam. The presence of a background illumination increases the value of Ib and numerical integration decreases the value of γ at which quasi-soliton like propagation occurs, thus explaining the decreased focusing observed.
Photorefractive diffusion-driven self-focusing and self-trapping in near-transition paraelectric crystals / Bruno, Crosignani; DEL RE, Eugenio; Paolo Di, Porto; Mario, Tamburrini; Antonio, Degasperis; Aharon, Agranat; Mordechai, Segev. - STAMPA. - (1998), pp. 411-413. (Intervento presentato al convegno Proceedings of the 1998 IEEE Nonlinear Optics Topical Meeting tenutosi a Princeville, HI, USA nel 10 August 1998 through 14 August 1998) [10.1109/nlo.1998.710337].
Photorefractive diffusion-driven self-focusing and self-trapping in near-transition paraelectric crystals
DEL RE, EUGENIO;
1998
Abstract
The observation of self-focusing and self-trapping in potassium lithium tantalate niobate (KLTN) crystals in a very-near-transition paraelectric phase without any external applied field and without any sort of artificial background illumination is reported. This behavior depends only on the temperature T of the sample and is independent on beam intensity and size. Finally, the effect of background illumination in KLTN is studied using a y polarized uniform beam of the same intensity as the focused beam. The presence of a background illumination increases the value of Ib and numerical integration decreases the value of γ at which quasi-soliton like propagation occurs, thus explaining the decreased focusing observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.