Small-Scale Self-Focusing of Divergent Beams in Gain Medium

Yanli, 张艳丽 Zhang; Xiaoyan, 李小燕 Li; Jianqiang, 朱健强 Zhu

doi:10.3788/aos20092903.0786

Cited by 2 publications

(1 citation statement)

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“…According to differences in the phenomenon, some unique analysis methods have been constructed. The aperture of self-focusing contains whole beam self-focusing [20,21] and small-scale self-focusing [1,3]; the response time of material polarization contains the two options of steady state for nanosecond or even longer pulses [1,2] and transient state for picosecond or even shorter pulses [1,22,23]; the degree of beam diffraction contains plane wave beam self-focusing [1,2] and tapered beam self-focusing [24,[27][28][29]; interaction includes the variants of single-wavelength beam self-focusing [1][2][3][4][5][6][7][8][9][10][11][12][13] and multi-wavelength beam self-focusing [25,26].…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis on small-scale self-focusing of multi-wavelength beams in an isotropic medium

Li¹,

Zhou²,

Bao³

et al. 2020

Laser Phys.

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An analytic model for nonlinear propagation theory is developed for multi-wavelength laser beams propagating in an isotropic media. The small-scale self-focusing theoretical solution of multi-wavelength beams is obtained and is superposed by eigenfunctions with multiple local fastest-growth frequency, so the traditional B-integral obtained from a single-wavelength beam cannot be used to describe the small-scale self-focusing of multi-wavelength beams. Some laws for multi-wavelength beams propagating in an isotropy medium are also found, such as the self-focusing distance decreasing, the large angle scattering increasing and the spatial distributions of each wavelength trending to be consistent. The theoretical laws are confirmed by integrated numerical simulations and provide an explanation for the final optics phenomenon in high power lasers. The results promote the understanding of self-focusing theory and provide a very promising tool for beam control, which can transfer information from one beam to another through isotropic media.

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