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优化用于相干拉曼光谱的激光脉冲配置。

Optimizing the laser-pulse configuration for coherent Raman spectroscopy.

作者信息

Pestov Dmitry, Murawski Robert K, Ariunbold Gombojav O, Wang Xi, Zhi Miaochan, Sokolov Alexei V, Sautenkov Vladimir A, Rostovtsev Yuri V, Dogariu Arthur, Huang Yu, Scully Marlan O

机构信息

Institute for Quantum Studies and Departments of Physics and Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.

出版信息

Science. 2007 Apr 13;316(5822):265-8. doi: 10.1126/science.1139055.

Abstract

We introduce a hybrid technique that combines the robustness of frequency-resolved coherent anti-Stokes Raman scattering (CARS) with the advantages of time-resolved CARS spectroscopy. Instantaneous coherent broadband excitation of several characteristic molecular vibrations and the subsequent probing of these vibrations by an optimally shaped time-delayed narrowband laser pulse help to suppress the nonresonant background and to retrieve the species-specific signal. We used this technique for coherent Raman spectroscopy of sodium dipicolinate powder, which is similar to calcium dipicolinate (a marker molecule for bacterial endospores, such as Bacillus subtilis and Bacillus anthracis), and we demonstrated a rapid and highly specific detection scheme that works even in the presence of multiple scattering.

摘要

我们介绍了一种混合技术,该技术将频率分辨相干反斯托克斯拉曼散射(CARS)的稳健性与时间分辨CARS光谱的优势相结合。对几种特征分子振动进行瞬时相干宽带激发,并随后通过优化形状的延时窄带激光脉冲对这些振动进行探测,有助于抑制非共振背景并获取物种特异性信号。我们将此技术用于二吡啶甲酸钠粉末的相干拉曼光谱分析,二吡啶甲酸钠与二吡啶甲酸钙(一种用于检测诸如枯草芽孢杆菌和炭疽芽孢杆菌等细菌芽孢的标记分子)相似,并且我们展示了一种即使在存在多次散射的情况下仍能工作的快速且高度特异性的检测方案。

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