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Focal shift in focused truncated pulsed-laser beam

机译:聚焦截断脉冲激光束的焦移

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摘要

The focal shift of a focused truncated pulsed-laser beam is investigated. In the case of the Fresnel approximation,the analytic expression of the time-averaged intensity distribution along the axis is derived based on the series expansion. It shows that the focal shift of the pulsed beam can be completely determined by a series of normalized spectrum moments and the central Fresnel number defined according to the central frequency of the pulse. The absolute value of the focal shift of the pulsed beam decreases monotonously and slowly with the normalized spectrum width increasing and the central Fresnel number fixed, and it increases monotonously with the central Fresnel number decreasing and the normalized spectrum width fixed. Besides the central Fresnel number and the normalized spectrum width, the shape of spectral intensity of the pulse affects the focal shift too.
机译:研究了聚焦的截断脉冲激光束的焦移。在菲涅耳近似的情况下,基于级数展开,得出沿轴的时间平均强度分布的解析表达式。它表明,可以通过一系列归一化频谱矩和根据脉冲的中心频率定义的中心菲涅耳数来完全确定脉冲束的焦点偏移。脉冲光束的焦点位移的绝对值随着归一化频谱宽度的增加和中心菲涅耳数的固定而单调缓慢地减小,而随着中心菲涅耳数量的减少和归一化频谱宽度的固定而单调地增加。除了中心菲涅耳数和归一化的光谱宽度之外,脉冲的光谱强度的形状也影响焦点偏移。

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  • 来源
    《Applied optics》 |2007年第25期|共6页
  • 作者

    Ying Zhong;

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  • 正文语种 eng
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