Pattern formation in the presence of walk-off for a type II optical parametric oscillator

Citation
G. Izus et al., Pattern formation in the presence of walk-off for a type II optical parametric oscillator, J OPT SOC B, 16(9), 1999, pp. 1592-1596
Citations number
25
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
ISSN journal
07403224 → ACNP
Volume
16
Issue
9
Year of publication
1999
Pages
1592 - 1596
Database
ISI
SICI code
0740-3224(199909)16:9<1592:PFITPO>2.0.ZU;2-G
Abstract
We show the relevance of walk-off effects in pattern formation in a type II optical parametric oscillator at frequency degeneracy. With walk-off negle cted only phase patterns are formed, and the intensity distribution is homo geneous. Walk-off changes the instability from absolute to convective for s ome parameter range. In the absolutely unstable regime it induces for each polarization component of light a competition between two phase stripe patt erns (traveling waves) of different wavelength. Phase stripe patterns at ea ch of the wavelengths are equally likely to be selected, and, after a trans ient regime of coexistence, one of them takes over. In the convectively uns table regime the existence of intensity patterns sustained by noise is show n. The patterns arise from the interference between traveling waves that ar e generated by the dynamical amplification of noise. (C) 1999 Optical Socie ty of America [S0740-3224(99)00209-X].