title: Stimulated Raman scattering and nonlinear focusing of high-power laser beams propagating in water.
abstract: The physical processes associated with propagation of a high-power (power > critical power for self-focusing) laser beam in water include nonlinear focusing, stimulated Raman scattering (SRS), optical breakdown, and plasma formation. The interplay between nonlinear focusing and SRS is analyzed for cases where a significant portion of the pump power is channeled into the Stokes wave. Propagation simulations and an analytical model demonstrate that the Stokes wave can re-focus the pump wave after the power in the latter falls below the critical power. It is shown that this novel focusing mechanism is distinct from cross-phase focusing. The phenomenon of gain-focusing discussed here for propagation in water is expected to be of general occurrence applicable to any medium supporting nonlinear focusing and stimulated Raman scattering.
authors.forename: B
authors.initials: B
authors.lastname: Hafizi
authors.forename: J P
authors.initials: JP
authors.lastname: Palastro
authors.forename: J R
authors.initials: JR
authors.lastname: Peñano
authors.forename: D F
authors.initials: DF
authors.lastname: Gordon
authors.forename: T G
authors.initials: TG
authors.lastname: Jones
authors.forename: M H
authors.initials: MH
authors.lastname: Helle
authors.forename: D
authors.initials: D
authors.lastname: Kaganovich