Acoustic-wave nonlinearity in stimulated Brillouin scattering

Autor:	Bruce S. Masson, Evangelos A. Coutsias
Rok vydání:	1994
Předmět:	Physics business.industry Scattering Phonon Physics::Optics Statistical and Nonlinear Physics Acoustic wave Atomic and Molecular Physics and Optics Optical pumping Laser linewidth Amplitude Optics Brillouin scattering Atomic physics business Multiple-scale analysis
Zdroj:	Journal of the Optical Society of America B. 11:1367
ISSN:	1520-8540 0740-3224
Popis:	Stimulated Brillouin scattering is investigated here under conditions characterized by high optical pump intensity. Calculations are carried out at 1.3 and 3.8 μm with pump intensities equal to approximately three times the threshold. Such strong optical forcing leads to significant self-distortion of the density profile in the material wave serving as the optical grating. The method of multiple scales is used to find a uniform asymptotic expansion in the coupling. At the first perturbation level the resonant portion of the problem yields abridged equations for the incident and the scattered waves with frequencies ωL and ωS = ωL − Ω and for the grating and its harmonics with frequencies nΩ. The nonresonant portion of the first perturbation yields field components with the frequencies ωL + nΩ and ωS − nΩ for n = 1, 2, …. Numerical solutions of the truncated abridged system are found by a method of Chebychev collocation and indicate a reduction in the observed phonon lifetime and a broadening of the linewidth with increasing amplitude.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d8665f01837d5caa22a7ca8137d31502 https://doi.org/10.1364/josab.11.001367 Zobrazit plný text záznamu