Continuous-wave stimulated Raman gain spectroscopy with cavity ringdown detection

被引:0
作者
F.V. Englich
Y. He
B.J. Orr
机构
[1] Macquarie University,Centre for Lasers and Applications
来源
Applied Physics B | 2006年 / 83卷
关键词
Raman Band; Pump Laser; Stimulate Raman Scattering; Tunable Diode Laser; Ringdown Time;
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学科分类号
摘要
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.
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页码:1 / 5
页数:4
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