Air-Laser-Based Standoff Coherent Raman Spectrometer

被引:64
作者
Fu, Yao [1 ]
Cao, Jincheng [1 ]
Yamanouchi, Kaoru [2 ]
Xu, Huailiang [1 ,3 ]
机构
[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China
[2] Univ Tokyo, Sch Sci, Dept Chem, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan
[3] CAS Ctr Excellence Ultraintense Laser Sci, Shanghai 201800, Peoples R China
来源
ULTRAFAST SCIENCE | 2022年 / 2022卷
基金
中国国家自然科学基金; 日本学术振兴会;
关键词
SPECTROSCOPY;
D O I
10.34133/2022/9867028
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Among currently available optical spectroscopic methods, Raman spectroscopy has versatile application to investigation of dynamical processes of molecules leading to chemical changes in the gas and liquid phases. However, it is still a challenge to realize an ideal stando ff coherent Raman spectrometer with which both high temporal resolution and high -frequency resolution can be achieved, so that one can remotely probe chemical species in real time with high temporal resolution while monitoring the populations in their respective rovibronic levels in the frequency domain with su ffi ciently high spectral resolution. In the present study, we construct an air -laser -based Raman spectrometer, in which near -infrared femtosecond (fs) laser pulses at 800 nm and cavity -free picosecond N 2 + air -laser pulses at 391 nm generated by the fi lamentation induced by the fs laser pulses are simultaneously used, enabling us to generate a hybrid ps/fs laser source at a desired stando ff position for stando ff surveillance of chemical and biochemical species. With this prototype Raman spectrometer, we demonstrate that the temporal evolution of the electronic, vibrational, and rotational states of N 2 + and the coupling processes of the rovibrational wave packet of N 2 molecules can be probed.
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页数:9
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