Self-focusing of Intense Light Beams

Lugovoi, V. N.; Prokhorov, A M

doi:10.1070/pu1970v013n02abeh004240

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“…Conical emission, arising from alkali metal vapor following near-resonant pulsed laser excitation, associated with spectral line broadening, frequency shift of emission, and cone angle variation with respect to the wavelength of the exciting laser pulse and self-action processes in the nonlinear medium, has been the subject of numerous experimental and theoretical considerations over the past two decades. Various effects, mainly based on radiation generation via parametric wave mixing, three-photon scattering and temporal pulse reshaping of Rabi-sideband amplification, [1][2][3][4][5][6] stimulated Raman 7 and hyperfine Raman scattering accompanied by self-phase modulation, 8 pulse breakup into solitary waves, 9 Cerenkov-like radiation generation [10][11][12][13] and diffraction-free encoding followed by free space propagation 14 have been taken into account to describe conical emission features and origins of offaxis emission-generation processes.…”

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confidence: 99%

Spectral and spatial evolution of a conical emission in Na vapor

et al. 1998

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A detailed study on yellow conical emission observed in dense sodium vapor following near-resonant onephoton excitation of the Na 4 2 P levels was performed. The origins of conical emission are suggested to be due to Raman resonant four-wave parametric mixing processes. In order to describe spectral and spatial features of off-axis emission, we introduce self-phase modulation and induced-phase modulation as important additional nonlinear processes, explaining the nonmonotonic detuning of the wavelength of the conical radiation with the exiting laser wavelength in the vicinity of resonance transitions. The spatial evolution of emission generated via four-wave mixing is modeled by solving the two-dimensional nonlinear Schrödinger equation describing the spatial evolution of light beams in a nonlinear media. Experimental and theoretical results are presented and discussed.

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