Mid-infrared femtosecond pulses obtained by optical rectification of 10-fs optical pulses

A. Bonvalet, J. Martin, A. Migus, M. Joffre
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引用次数: 0

Abstract

We generate quasi single-cycle femtosecond pulses in the mid-infrared spectral domain by performing the optical rectification of 10-fs visible pulses. This represents a tenfold increase in the frequencies achieved through optical rectification, previously generated in the far-infrared domain only. The 10-fs pulses produced by a 100-MHz Ti:sapphire oscillator are first sent through a modified Michelson interferometer, allowing to focus a sequence of two pulses on a nonlinear material such as GaAs or GaSe. Due to the second-order nonlinear response of these materials, the incident pulses are optically rectified. This results in a transient polarization of duration 10 fs, which in turn radiates an electromagnetic wave with frequency components ranging from 0 to 50 THz.
由10-fs光脉冲的光学整流得到的中红外飞秒脉冲
我们通过对10-fs可见脉冲进行光学整流,在中红外光谱域产生准单周期飞秒脉冲。这表示通过光学整流实现的频率增加了十倍,以前仅在远红外域产生。由100兆赫的钛蓝宝石振荡器产生的10-fs脉冲首先通过一个改进的迈克尔逊干涉仪发送,允许将两个脉冲序列聚焦在非线性材料上,如GaAs或GaSe。由于这些材料的二阶非线性响应,入射脉冲被光学整流。这导致持续时间为10fs的瞬态极化,这反过来又辐射出频率成分范围为0到50太赫兹的电磁波。
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