Polarization-sensitive femtosecond mid-infrared spectrometer with a tunable Fabry-Perot filter and chirped-pulse upconversion

被引：0
作者：
Nakamura, Ryosuke [1 ]
Inagaki, Yoshizumi [1 ,2 ]
Kamimura, Tomosumi [2 ]
机构：
[1] Osaka Univ, Sci & Technol Entrepreneurship Lab, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
[2] Osaka Inst Technol, Dept Elect Informat & Commun Engn, Osaka 5358585, Japan
来源：
APPLIED OPTICS | 2018年 / 57卷 / 36期
关键词：
INFRARED-SPECTROSCOPY; CO;
D O I：
10.1364/AO.57.010517
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Femtosecond time-resolved mid-infrared (MIR) spectroscopy based on chirped-pulse upconversion is a promising method for observing molecular structure and vibrational dynamics. By using a polarized narrowband pump pulse in which center frequency is rapidly scanned with an electrically tunable Fabry-Perot filter, we have developed a femtosecond MIR spectrometer that is more sensitive to molecular structure. The pump energy and polarization dependences of transient MIR absorption spectra measured with the spectroscopic system revealed the appearance of a dark (infrared-inactive) mode due to a slight decrease in the molecular symmetry of a metal carbonyl complex, Mn-2(CO)(10), in solution. In addition, the rotational relaxation time of Mn-2(CO)(10) in solution was determined as approximately 20 ps. (C) 2018 Optical Society of America
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页码：10517 / 10521
页数：5
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