Measurements of the nonresonant third-order susceptibilities of gases using coherent anti-Stokes Raman spectroscopy
Abstract
The paper reports on measurements of the nonresonant third-order susceptibilities of the gases water vapor, n-butane, and propane. The susceptibilities were obtained from scanned coherent anti-Stokes Raman spectroscopy (CARS) spectra of binary gas mixtures containing N2 and each species of interest. The resonant susceptibility of N2, which served as a calibration standard for the measurements, was calculated using a modified exponential-gap model. Raman transition linewidths for the model were based on separate measurements by inverse Raman spectroscopy. The nonresonant contributions from distant Raman transitions, predominantly C-H stretch modes were measured separately. For parallel-polarized CARS configurations, the total effective nonresonant susceptibilities for propane, n-butane, and water vapor, respectively, were found to be 11.5 + or - 1.4, 14.4 + or - 1.8, and 2.2 + or - 0.3 times that of N2.
- Publication:
-
Journal of the Optical Society of America B Optical Physics
- Pub Date:
- August 1987
- DOI:
- 10.1364/JOSAB.4.001241
- Bibcode:
- 1987JOSAB...4.1241F
- Keywords:
-
- Butanes;
- Gas Spectroscopy;
- Magnetic Permeability;
- Propane;
- Raman Spectroscopy;
- Water Vapor;
- Air Breathing Engines;
- Binary Mixtures;
- Gas Mixtures;
- Nitrogen;
- Signal To Noise Ratios;
- Temperature Dependence;
- Instrumentation and Photography