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 Title: LASER-INDUCED PLASMAS IN AMBIENT AIR FOR INCOHERENT BROADBAND CAVITY-ENHANCED ABSORPTION SPECTROSCOPY Author(s): Ruth, Albert A Contributor(s): Orphal, Johannes; Dixneuf, Sophie Subject(s): Instrument/Technique Demonstration Abstract: The emission from a laser-induced plasma in ambient air, generated by a high power femtosecond laser, was utilized as pulsed incoherent broadband light source in the center of a quasi-confocal high finesse cavity. The time dependent spectra of the light leaking from the cavity was compared with those of the laser-induced plasma emission without the cavity. It was found that the light emission was sustained by the cavity despite the initially large optical losses of the laser-induced plasma in the cavity. The light sustained by the cavity was used to measure part of the $rm S_1leftarrowrm S_0$ absorption spectrum of gaseous azulene at its vapour pressure at room temperature in ambient air as well as the strongly forbidden $gamma$--band in molecular oxygen: $rm b^1Sigma^+_g (nu'=2)leftarrow X^3Sigma^-_g (nu''=0)$ Issue Date: 25-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79412 Date Available in IDEALS: 2016-01-05
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