Microwave re-excitation of femtosecond laser tagging for highly flexible velocimetry

Molecular tagging velocimetry is typically species specific and limited by excited state/species lifetimes. We utilize laser-generated ionization, long-lived anions, and a time-delayed microwave pulse to monitor the tagged region up to several milliseconds. This non-resonant excitation and microwave...

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Bibliographic Details
Published in:Optics letters 2024-05, Vol.49 (9), p.2265-2268
Main Authors: Reinbacher, Fynn, Bidwai, Sarang, Michael, James B
Format: Article
Language:English
Subjects:
Excitation
Gas mixtures
Interrogation
Molecular tagging velocimetry
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Summary:Molecular tagging velocimetry is typically species specific and limited by excited state/species lifetimes. We utilize laser-generated ionization, long-lived anions, and a time-delayed microwave pulse to monitor the tagged region up to several milliseconds. This non-resonant excitation and microwave interaction is demonstrated in a range of gas mixtures. Signal levels show up to 1000-fold improvement, and the flexibility in interrogation time allows for velocity measurements over a large dynamic range (1-100 m/s) with single-shot precision of
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.522115