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Spectral analysis and control to obtain sub-5 fs pulses by femtosecond filamentation

机译:光谱分析和控制,通过飞秒细丝化获得亚5 fs脉冲

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摘要

A spectral-filter method is numerically demonstrated to obtain sub-5 fs pulses by using femtosecond fila-mentation in fused silica. Instead of employing spectral phase compensation, by properly employing a high-pass filter to select the broadened high-frequency spectra that are located almost in phase in the tailing edge of the self-compressed pulses owing to self-steepening, as short as single-cycle pulses can be obtained. For instance, for an input pulse with a duration of 50 fs and energy 2.2 (mu)J, the minimum pulse duration can reach to approx4 fs (about 1.5 cycles) by applying a proper spectral filter.
机译:数值证明了光谱过滤方法,可通过在熔融石英中使用飞秒纤丝化来获得亚5 fs脉冲。通过适当地使用高通滤波器来选择加宽的高频频谱,而不是采用频谱相位补偿,这些频谱由于自身变窄而位于自压缩脉冲的尾沿中几乎同相,而短至单个可以获得周期脉冲。例如,对于持续时间为50 fs,能量为2.2μJ的输入脉冲,通过应用适当的频谱滤波器,最小脉冲持续时间可以达到约4 fs(约1.5个周期)。

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