We measure the detailed spatiotemporal profiles of femtosecond laser pulses in the infrared wavelength range of $\lambda =2.5–11\mathrm{\mu m}$ and the absolute nonlinear response of major air constituents (${\mathrm{N}}_2$, ${\mathrm{O}}_2$, and Ar) over this range. The spatiotemporal measurements reveal wavelength-dependent pulse front tilt and temporal stretching in the infrared pulses.

中文翻译：

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2.5-11μm超短红外脉冲：空气成分的时空剖面和绝对非线性响应

我们测量飞秒激光脉冲的红外波长范围内的详细时空剖面 $\lambda =2.5–11\mathrm{微米}$ 以及主要空气成分的绝对非线性响应（${\mathrm{ñ}}_{\mathrm{2个}}$， ${\mathrm{Ø}}_{\mathrm{2个}}$，和Ar）在此范围内。时空测量揭示了与波长有关的脉冲前倾和红外脉冲中的时间拉伸。