Infrared Seeded Parametric Four-Wave Mixing for Sensitive Detection of Molecules
- Molecular Dynamics Laboratory, Faculty of Science, Griffith University, Nathan, Queensland, (Australia), 4111
- Physics Department, University of Queensland, St.Lucia, Queensland, (Australia), 4072
We have developed a sensitive resonant four-wave mixing technique based on two-photon parametric four-wave mixing with the addition of a phase matched {open_quotes}seeder{close_quotes} field. Generation of the seeder field via the same four-wave mixing process in a high pressure cell enables automatic phase matching to be achieved in a low pressure sample cell. This arrangement facilitates sensitive detection of complex molecular spectra by simply tuning the pump laser. We demonstrate the technique with the detection of nitric oxide down to concentrations more than 4 orders of magnitude below the capability of parametric four-wave mixing alone, with an estimated detection threshold of 10{sup 12} molecules/cm {sup 3} . {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 587143
- Journal Information:
- Physical Review Letters, Vol. 79, Issue 11; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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