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- Title
Continuous-wave stimulated Raman gain spectroscopy with cavity ringdown detection.
- Authors
Englich, F. V.; He, Y.; Orr, B. J.
- Abstract
Cavity ringdown (CRD) spectroscopy is extended for the first time from its conventional optical-absorption mode of operation into the regime of coherent Raman spectroscopy. Continuous-wave (cw) stimulated Raman gain (SRG) spectra of the 2916.5-cm-1 ν1 rovibrational fundamental Raman band of methane (CH4) gas are measured, using tunable cw laser light at ∼1544 nm to probe ringdown decay from a rapidly swept optical cavity that is itself inside the cavity of a cw single-longitudinal-mode Nd:YAG ring laser operating at ∼1064.5 nm. The resulting change of ringdown decay rate is dependent on pump laser irradiance and is associated with Raman gain. Remarkably, such SRG-CRD resonances display ringdown times that are longer than in the off-resonance case, contrasting with the usual reduction of ringdown time associated with absorption and other loss processes.
- Subjects
SPECTRUM analysis; RAMAN effect; METHANE; LASERS; RESONANCE; NONLINEAR electric circuits
- Publication
Applied Physics B: Lasers & Optics, 2006, Vol 83, Issue 1, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-006-2144-y