High spectral resolution multiplex CARS spectroscopy using chirped pulses
High spectral resolution multiplex CARS spectroscopy using chirped pulses
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DOI：
10.1016/j.cplett.2004.02.049
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发表时间：
2004-04-01
影响因子：
2.8
通讯作者：
Saykally, RJ
中科院分区：
文献类型：
--
作者：
Knutsen, KP;Johnson, JC;Saykally, RJ
提出了一种利用飞秒激光系统实现高光谱分辨率相干反斯托克斯拉曼散射（CARS）光谱的简单技术。仅当与斯托克斯脉冲 (90 fs) 及时重叠时，线性啁啾和拉伸（类似于 10 ps）泵浦脉冲才会生成 CARS 信号，从而创建定义该技术光谱分辨率的“时间狭缝”。提出了液体甲醇和液体异辛烷的多重 CARS 光谱，表明光谱分辨率优于 5 cm(-1)。这种新的啁啾（c-CARS）技术应该被证明对化学选择性成像应用有用，因为它显着减少了非共振背景贡献。 (C) 2004 Elsevier B.V. 保留所有权利。
A simple technique for achieving high spectral resolution coherent anti-Stokes Raman scattering (CARS) spectra with a femtosecond laser system is presented. A linearly chirped and stretched (similar to10 ps) pump pulse generates CARS signal only when overlapped in time with the Stokes pulse (90 fs), creating a 'temporal slit' that defines the spectral resolution of the technique. Multiplex CARS spectra for liquid methanol and liquid isooctane are presented, demonstrating a spectral resolution of better than 5 cm(-1). This new chirped (c-CARS) technique should prove useful for chemically-selective imaging applications, as it significantly reduces the non-resonant background contribution. (C) 2004 Elsevier B.V. All rights reserved.