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Stimulated Raman Scattering and Nonlinear Focusing of High-Power Laser Beams Propagating in Water

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. While discussed here in the context of propagation in water, the gain-focusing phenomenon is general to any medium supporting nonlinear focusing and stimulated forward Raman scattering.

preprint2015arXivOpen access
B. HafiziJ. P. PalastroJ. R. PenanoD. F. GordonT. G. JonesM. H. HelleD. Kaganovich
physics.optics
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B. HafiziJ. P. PalastroJ. R. PenanoD. F. GordonT. G. JonesM. H. HelleD. Kaganovich

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