LASER-INDUCED PLASMAS IN AMBIENT AIR FOR INCOHERENT BROADBAND CAVITY-ENHANCED ABSORPTION SPECTROSCOPY

Ruth, Albert A

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https://hdl.handle.net/2142/79412 Copy

Description

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

Issue Date

25-Jun-15

Keyword(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: $rm b^1Sigma^+_g (nu'=2)leftarrow X^3Sigma^-_g (nu''=0)$

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79412

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