Advantages of coherent antistokes Raman scattering (CARS) in environmental monitoring

Ralf Paetzold; Eberhard Voss; Thorsten de Vries; H. Darpel; Angelika Anders

doi:10.1117/12.364196

16 September 1999 Advantages of coherent antistokes Raman scattering (CARS) in environmental monitoring

Ralf Paetzold, Eberhard Voss, Thorsten de Vries, H. Darpel, Angelika Anders

Proceedings Volume 3821, Environmental Sensing and Applications; (1999) https://doi.org/10.1117/12.364196
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

The objective of this investigation was to develop a fast method for the in-situ characterization of chemicals solved in water based on Coherent Antistokes Raman Scattering (CARS). In order to test the potential of CARS as a tool for the in-situ spectroscopy scanning and multiplex CARS techniques were investigated. Polarization CARS (PCARS) was used to reduce the nonvibrational resonant signal generated by the electron cloud of the solvent molecules. The spectra of some alcohols and pollutants such as pyridine, nitrate and sulfate were investigated. Computer simulations were applied for the evaluation of the CARS spectra. The most evident advantage of CARS in comparison with other Raman methods is the very short time to achieve a spectrum. The shortest time to get a spectrum is limited by the length of the laser pulse (e.g. 5 ns). In addition no sample preparation is necessary.

Citation Download Citation

Ralf Paetzold, Eberhard Voss, Thorsten de Vries, H. Darpel, and Angelika Anders "Advantages of coherent antistokes Raman scattering (CARS) in environmental monitoring", Proc. SPIE 3821, Environmental Sensing and Applications, (16 September 1999); https://doi.org/10.1117/12.364196

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