Stimulated thermal scattering induced by two-photon absorption and experimental observation of genuine stimulated brillouin scattering in the near-ultraviolet region

Issue title: Atomic and molecular nonlinear optics: Theory, Experiment and Computation A homage to the pioneering work of Stanisław Kielich (1925-1993)

Guest editors: G. Maroulis, T. Bancewicz, B. Champagne and A.D. Buckingham

Article type: Research Article

Authors: Karpov, V.B. | Korobkin, V.V.

Affiliations: Coherent and Nonlinear Optics Department, A.M.Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilov Street 38, 119991 Moscow, Russia. E-mail: [email protected]; [email protected]

Abstract: Some of the experimental measurements of the frequency shift and phase-conjugation fidelity gained from previous studies of stimulated scattering (SS) of nanosecond (5 ÷ 10 ns) near-ultraviolet (uv) (λ = 193 ÷ 351 nm) laser pulses in liquids (hexane, heptane, and others) are found to disagree with the theory of SS, which takes into account only the linear (single-photon) light absorption. To resolve the inconsistency, SS of XeCl excimer laser radiation (λ = 308 nm) with the duration of 8 ns in liquid hexane is investigated experimentally. A theoretical analysis of the results obtained revealed three nonlinear optical phenomena induced by the heating due to two-photon absorption: stimulated thermal scattering (two-photon STS-2), phase mismatch for stimulated Brillouin scattering (SBS), and phase self-modulation. The experimental SS spectrum contains two additional lines – a two-photon STS-2 line and a genuine SBS line in the near-uv region.

DOI: 10.3233/JCM-2010-0329

Journal: Journal of Computational Methods in Sciences and Engineering, vol. 10, no. 3-6, pp. 401-423, 2010