Sub-Doppler high-resolution wave-mixing detection method for isotopes in environmental applications

Ronald Briggs; Julia Schafer; Wendy Lyons; William G. Tong

doi:10.1117/12.571536

7 December 2004 Sub-Doppler high-resolution wave-mixing detection method for isotopes in environmental applications

Ronald Briggs, Julia Schafer, Wendy Lyons, William G. Tong

Proceedings Volume 5586, Advanced Environmental, Chemical, and Biological Sensing Technologies II; (2004) https://doi.org/10.1117/12.571536
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

Sub-Doppler laser wave-mixing spectroscopy is presented as a sensitive and high-resolution optical method for measuring isotopes and hyperfine structures. By fingerprinting isotopes at sensitive levels, one can track biohazardous pollutants in various environmental samples since isotope and hyperfine profiles are unique and characteristic of specific locations and sources including those for heavy metal contaminants and chemical runoff. We present an unusually sensitive optical absorption method that offers isotope specificity and resolution at excellent detection sensitivity levels. Sub-Doppler laser wave-mixing spectroscopy is a resonant nonlinear optical technique which uses three intersecting laser beams to produce a signal beam that has all the coherent properties of the original input laser beams. This laser-like signal beam can be efficiently directed, collected, filtered and detected. The use of counter-propagating input beams minimizes Doppler broadening and the resulting sub-Doppler spectral resolution is suitable for isotope and hyperfine splitting measurements. This relatively simple absorption-based method offers better sensitivity and selectivity levels and it requires minimum sample preparation steps.

Citation Download Citation

Ronald Briggs, Julia Schafer, Wendy Lyons, and William G. Tong "Sub-Doppler high-resolution wave-mixing detection method for isotopes in environmental applications", Proc. SPIE 5586, Advanced Environmental, Chemical, and Biological Sensing Technologies II, (7 December 2004); https://doi.org/10.1117/12.571536

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