Measurements of the concentration of organic solutions by femtosecond time-resolved ERE-CARS  

作　　者：HE Ping WANG Ming WANG HuiLi FAN RongWei CHEN DeYing YU Xin WANG JiaLing JIANG YuGang 

机构地区：[1]College of Foundation Science,Harbin University of Commerce,Harbin 150028,China [2]National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150080,China [3]Institute of Opto-electronics,Harbin Institute of Technology,Harbin 150080,China [4]Tianjin Key Laboratory of Optical Thin Films,Tianjin Jinhang Institute of Technical Physics,Tianjin 300192,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第10期1808-1812,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 61008023);the Program of Excellent at Harbin Institute of Technology

摘　　要：A variant of all-resonant CARS named electronic-resonant enhancement CARS （ERE-CARS） is applied to measure the methanol-water solution concentration at room temperature. The measurements are performed using the ERE-CARS signal of the Raman vibrations near the C--H stretching modes （at 2835 and 2942 cm^-1） in methanol. By changing the timing （△t〉0） of the laser pulses of this non-degenerate four wave mixing technique, the concentration information based on the vibrational dynamics of the C--H bonds can be successfully detected as the frequency-spread dephasing rate duiing the first few hundred fs in the ERE-CARS signal with high sensitivity and accuracy. Femtosecond time-resolved ERE-CARS technique is applied to the concentration analysis of a mixture of the organic solution. This investigation indicates that femtosecond time-resolved ERE-CARS technique might be a powerful tool for real-time detection for solution concentration of different liquids.A variant of all-resonant CARS named electronic-resonant enhancement CARS(ERE-CARS) is applied to measure the methanol-water solution concentration at room temperature.The measurements are performed using the ERE-CARS signal of the Raman vibrations near the C-H stretching modes(at 2835 and 2942 cm 1) in methanol.By changing the timing(t>0) of the laser pulses of this non-degenerate four wave mixing technique,the concentration information based on the vibrational dynamics of the C-H bonds can be successfully detected as the frequency-spread dephasing rate during the first few hundred fs in the ERE-CARS signal with high sensitivity and accuracy.Femtosecond time-resolved ERE-CARS technique is applied to the concentration analysis of a mixture of the organic solution.This investigation indicates that femtosecond time-resolved ERE-CARS technique might be a powerful tool for real-time detection for solution concentration of different liquids.

关 键 词：FEMTOSECOND ERE-CARS time-resolved spectroscopy CONCENTRATION 

分 类 号：TQ610.7[化学工程—精细化工] TH744.41[机械工程—光学工程]