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Stimulated Raman scattering and nonlinear focusing of high-power laser beams propagating in water

Stimulated Raman scattering and nonlinear focusing of high-power laser beams propagating in water

Optics Letters 40(7): 1556-1558

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.

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Accession: 058905710

Download citation: RISBibTeXText

PMID: 25831383

DOI: 10.1364/ol.40.001556

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