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https://hdl.handle.net/2440/69009
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Type: | Journal article |
Title: | Continuous-wave cavity-ringdown detection of stimulated Raman gain spectra |
Author: | Englich, Florian Viktor He, Y. Orr, Brian J. |
Citation: | Applied Physics B: Lasers and Optics, 2009; 94(1):2-27 |
Publisher: | Springer |
Issue Date: | 2009 |
ISSN: | 0946-2171 |
School/Discipline: | School of Chemistry and Physics |
Statement of Responsibility: | F.V. Englich, Y. He and B.J. Orr |
Abstract: | Cavity ringdown (CRD) spectroscopy, with its high sensitivity, provides a novel way to perform continuouswave (cw) stimulated Raman gain (SRG) spectroscopy, rather than by conventional optically detected coherent Raman techniques. Tunable cw laser light at ∼1544 nm is used to probe ringdown decay from a rapidly-swept, high-finesse optical cavity containing a gas-phase sample of interest and itself located inside the cavity of a cw single-longitudinal-mode Nd:YAG ring laser operating at ∼1064.4 nm. This approach is used to measure cw SRG spectra of the ν1 fundamental rovibrational Raman band of methane gas at ∼ 2916.5 cm−1. The resulting SRG-CRD resonances have ringdown times longer than in the off-resonance case, in contrast to the usual shorter ringdown times arising from absorption and other loss processes. Previously reported noise-equivalent sensitivities have been substantially improved, by using a second ringdown cavity to facilitate subtraction of infrared-absorption background signals. Moreover, by employing a ringdown cavity in the form of a ring, the SRG-pump and CRD-detected Stokes beams can co-propagate uni-directionally, which significantly reduces Doppler broadening. |
Rights: | © Springer-Verlag 2008 |
DOI: | 10.1007/s00340-008-3286-x |
Appears in Collections: | IPAS publications |
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