Coherent anti-Stokes Raman micro-spectroscopy using spectral focusing: theory and experiment
Coherent anti-Stokes Raman micro-spectroscopy using spectral focusing: theory and experiment
复制标题
DOI：
10.1002/jrs.2264
复制
发表时间：
2009-07-01
影响因子：
2.5
通讯作者：
Borri, Paola
中科院分区：
文献类型：
--
作者：
Langbein, Wolfgang;Rocha-Mendoza, Israel;Borri, Paola
从理论和实验两方面讨论了利用线性啁啾飞秒激光脉冲和光谱及时间积分探测的相干反斯托克斯拉曼散射（汽车）显微术。通过匹配斯托克斯和泵浦脉冲的线性啁啾，光谱分辨率降低到啁啾脉冲持续时间的傅立叶极限（光谱聚焦）。讨论了泵浦脉冲和斯托克斯脉冲的时间顺序对信号强度和选择性的影响，并给出了相关量的解析表达式。考虑了由已知群速度色散的玻璃元件获得的线性啁啾，分析了高阶玻璃色散对光谱分辨率的限制。实验证实的理论，使用100 fs的激光脉冲，SF57玻璃元件，和聚苯乙烯珠作为测试样品。版权所有（C）2009约翰威利父子有限公司
Coherent anti-Stokes Raman scattering (CARS) microscopy using linearly chirped femtosecond laser pulses and spectrally and time-integrated detection is discussed both theoretically and experimentally. By matching the linear chirp of Stokes and pump pulses, the spectral resolution is reduced to the Fourier limit of the chirped pulse duration (spectral focusing). We discuss the effect of the time-ordering of Pump and Stokes pulses on the signal strength and selectivity, and give analytical expressions for the relevant quantities. We consider linear chirp obtained by glass elements of known group-velocity dispersion, and analyze the limit of the spectral resolution by higher order glass dispersion. Experiments corroborating the theory are presented, using 100 fs laser pulses, SF57 glass elements, and polystyrene beads as test samples. Copyright (C) 2009 John Wiley & Sons, Ltd.