Burst-mode femtosecond laser electronic excitation tagging for kHz–MHz seedless velocimetry

Burst-mode femtosecond laser electronic excitation tagging (FLEET) of nitrogen is introduced for tracking the velocity field in high-speed flows at kilohertz–megahertz (kHz–MHz) repetition rates without the use of added tracers. A custom-built Nd:glass femtosecond laser is used to produce 500 pulses...

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Bibliographic Details
Published in:Optics letters 2020-01, Vol.45 (2), p.335
Main Authors: Fisher, Jordan M., Smyser, Michael E., Slipchenko, Mikhail N., Roy, Sukesh, Meyer, Terrence R.
Format: Article
Language:English
Subjects:
Excitation
Femtosecond pulsed lasers
Lasers
Marking
Neodymium lasers
Tracers
Velocimetry
Velocity distribution
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Summary:Burst-mode femtosecond laser electronic excitation tagging (FLEET) of nitrogen is introduced for tracking the velocity field in high-speed flows at kilohertz–megahertz (kHz–MHz) repetition rates without the use of added tracers. A custom-built Nd:glass femtosecond laser is used to produce 500 pulses per burst with pulses having a temporal separation as short as 1 µs, an energy of 120 µJ, and a duration of 274 fs. This enables 2 orders of magnitude higher measurement bandwidth over conventional kHz-rate FLEET velocimetry. Characteristics of the optical system are described, along with a demonstration of time-resolved velocity measurements with ∼ 0.5 % precision in a supersonic slot jet.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.380109