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Laser Linewidth and Spectral Resolution in Infrared Scanning Sum Frequency Generation Vibrational Spectroscopy System
Feng Wei,Wen-xiu Xia,Zhong-jin Hu,Wen-hui Li,Ji-ying Zhang,Wan-quan Zheng
Author NameAffiliationE-mail
Feng Wei Institute for Interdisciplinary Research, & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China weifeng@jhun.edu.cn 
Wen-xiu Xia College of Life Science, Jianghan University, Wuhan 430056, China  
Zhong-jin Hu College of Life Science, Jianghan University, Wuhan 430056, China  
Wen-hui Li Institute for Interdisciplinary Research, & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China  
Ji-ying Zhang Institute for Interdisciplinary Research, & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China  
Wan-quan Zheng Institute for Interdisciplinary Research, & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China;Institute des Sciences Mol eculaires d'Orsay, Université; de Paris-Sud, 91405 Orsay Cedex, France  
Abstract:
Sum frequency generation vibrational spectroscopy (SFG-VS) is a robust technique for interfacial investigation at molecular level. The performance of SFG-VS mostly depends on the spectral resolution of the SFG system. In this research, a simplified function was deduced to calculate the spectral resolution of picosecond SFG system and the lineshape of SFG spectra based on the Guassian shaped functions of IR beam and visible beam. The function indicates that the lineshpe of SFG spectra from nonresonant samples can be calculated by the Guassian widths of both IR beam and visible beam. And the Voigt lineshape of SFG spectra from vibrational resonant samples can be calculated by the Homogeneous broadening (Lorentzian width) and Inhomogeneous broadening (Guassian width) of vibrational modes, as well as the Guassian widths of both IR beam and visible beam. Such functions were also applied to verify the spectral resolution of the polarization-resolved and frequency-resolved picosecond SFG-VS system which was developed by our group recently. It is shown that the linewidths of IR beams that generated from current laser system are about 1.5 cm-1. The calculated spectral resolution of current picosecond IR scanning SFG-VS system is about 4.6 cm-1, which is consist with he spctral resolution shown in the spectra of cholesterol monolayer (3.5-5 cm-1).
Key words:  Lineshape calculation  Sum frequency generation  Vibrational spectra  Spectral resolution
FundProject:This work was supported by the National Natural Science Foundation of China (No.21503093 and No.11547244) and the Doctorial Program of Jianghan University (No.1019-0610001).
红外扫描和频振动光谱系统的激光线宽与光谱分辨率
魏锋,夏文秀,胡中进,李雯慧,张纪英,郑万泉
摘要:
本文报道了一个简化的利用可见光和红外光带宽来计算和频光谱分辨率的公式. 公式显示和频振动光谱的Voigt线宽可以通过振动模式的均匀线宽(洛伦兹线宽)、非均匀线宽(高斯线宽)、红外光与可见光的高斯线宽计算获得. 利用本实验室新搭建的频率分辨及偏振分辨的皮秒和频光谱系统验证了该公式的准确性. 实验结果显示,本激光系统获取的红外光的高斯线宽为1.5 cm-1. 本激光系统的光谱分辨率约为4.6 cm-1,结果与胆固醇单层膜光谱获取的光谱分辨率(3.5~5 cm-1)基本一致.
关键词:  带宽计算  和频  振动光谱  光谱分辨率
DOI:10.1063/1674-0068/29/cjcp1601001
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