Spectral broadening of mid-infrared femtosecond pulses in GaAs.
Spectral broadening of mid-infrared femtosecond pulses in GaAs.
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GaAs 中红外飞秒脉冲的光谱展宽。
DOI：
10.1364/ol.34.003839
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发表时间：
2009
期刊：
影响因子：
3.6
通讯作者：
Y. Kawahara
中科院分区：
文献类型：
--
作者：
Satoshi Ashihara;Y. Kawahara
我们实现了几微焦耳能量的中红外脉冲的有效光谱展宽。中心波长为5000 nm的飞秒脉冲在砷化镓单晶中的非线性传输使其光谱带宽从540 nm增加到2060 nm（频率从220 cm（-1）增加到910 cm（-1））。光谱展宽伴随着25%的非线性吸收损失。所演示的方案应适用于材料透明度范围内的任何工作波长，并提供了一个有用的工具，在非线性振动光谱。
We achieved efficient spectral broadening for mid-IR pulses of few-microjoule energy. The spectral bandwidth of the femtosecond pulses at the center wavelength of 5000 nm increased from 540 nm to 2060 nm (from 220 to 910 cm(-1) in frequency) by nonlinear propagation in a gallium arsenide single crystal. The spectral broadening was accompanied by nonlinear absorption loss of 25%. The demonstrated scheme should be available at any operation wavelength within the material transparency range and provides a useful tool in nonlinear vibrational spectroscopy.