The thin structures of stimulated Brillouin scattering (SBS) and stimulated temperature scattering (STS) spectral components caused by two-photon heating are analyzed theoretically. In contrast to the linear (single photon) case for two-photon heating, a Stokes SBS component exhibits the spectral shift depending on the pump intensity. Emergence of an anti-Stokes SBS component is possible when the pump intensity is sufficiently high so that the positive two-photon thermal gain may compensate for the negative electrostrictive gain. The spectral components of STS caused by linear or two-photon absorption (essentially different linear or two-photon STS-2) possess the same thin structures.
© 2013 Optical Society of America
(140.2180) Lasers and laser optics : Excimer lasers
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.4180) Nonlinear optics : Multiphoton processes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
Original Manuscript: March 29, 2013
Revised Manuscript: May 31, 2013
Manuscript Accepted: June 2, 2013
Published: July 18, 2013
Vladimir B. Karpov and Vladlen V. Korobkin, "Nonresonant parametric amplification of the spontaneous Brillouin–Rayleigh triplet resulting from two-photon absorption," J. Opt. Soc. Am. B 30, 2174-2181 (2013)