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-...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.展开更多
基金Key Project of Chinese Academy of Sciences Knowledge Innovation Program(Grant No.KJCX3.SYW.N10)the National Natural Science Foundation of China(Grant No.10375085)
基金supported by the National Natural Science Foundation of China (Grant No. 61008023)the Program of Excellent at Harbin Institute of Technology
文摘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.
