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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Formation of conical emission of supercontinuum during filamentation of femtosecond laser radiation in fused silica
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Formation of conical emission of supercontinuum during filamentation of femtosecond laser radiation in fused silica

机译：飞秒激光在熔融石英中细丝化形成超连续体锥形发射。

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摘要

The formation of conical emission of supercontinuum during filamentation of femtosecond laser pulses with central wavelengths in a wide range is studied experimentally, numerically, and analytically. The frequency-angular intensity distribution of the spectral components of conical emission is determined by the interference of supercontinuum emission in a filament of a femtosecond laser pulse. The interference of supercontinuum emission has a general character, exists at different regimes of group velocity dispersion, gives rise to the fine spectral structure after the pulse splitting into subpulses and the formation of a distributed supercontinuum source in an extended filament, and causes the decomposition of the continuous spectrum of conical emission into many high-contrast maxima after pulse refocusing in the filament. In spectroscopic studies with a tunable femtosecond radiation source based on a TOPAS parametric amplifier, we used an original scheme with a wedge fused silica sample. Numerical simulations have been performed using a system of equations of nonlinear-optical interaction of laser radiation under conditions of diffraction, wave nonstationarity, and material dispersion in fused silica. The analytic study is based on the interference model of formation of conical emission by supercontinuum sources moving in a filament.
机译：通过实验，数值和分析方法研究了中心波长在宽范围内的飞秒激光脉冲细丝化过程中超连续谱圆锥形发射的形成。锥形发射光谱分量的频率角强度分布取决于飞秒激光脉冲灯丝中超连续谱发射的干扰。超连续谱发射的干扰具有普遍性，存在于不同的群速度色散机制中，在脉冲分裂成子脉冲并在延伸的灯丝中形成分布的超连续谱源后，产生了精细的光谱结构，并引起了分解。在细丝中脉冲重新聚焦之后，圆锥形发射的连续光谱变成许多高对比度的最大值。在基于TOPAS参数放大器的可调谐飞秒辐射源的光谱研究中，我们使用了带有楔形熔融石英样品的原始方案。在衍射，波非平稳性和材料在熔融石英中的分散条件下，使用激光辐射的非线性-光学相互作用方程组进行了数值模拟。该分析研究基于在细丝中移动的超连续谱源形成锥形发射的干涉模型。

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