Picosecond laser electronic excitation tagging velocimetry using a picosecond burst-mode laser

• DOI: 10.1364/ao.419491
• Publication Date: 2021-03-18T13:00:09Z
• Authors: Zhili Zhang; Naibo Jiang; Mikhail N. Slipch...; Jason G. Mance; Sukesh Roy
• Keywords: Picosecond

Detailed characterizations of picosecond laser electronic excitation tagging (PLEET) in pure nitrogen ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">N</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> ) and air with a 24 ps burst-mode system have been conducted. The is seeded 200 fs broadband seeding to achieve short pulse duration. As non-intrusive molecular velocimetry (MTV) technique, PLEET achieves “writing” via photo-dissociating molecules “tracking” by imaging the emissions. Key characteristics performance utilization pulse-burst for MTV were obtained, including lifetime emissions, power dependence, pressure local flow heating pulses. Based on experimental results physical mechanisms PLEET, can produce similar 100 kHz emissions photodissociation, while generating less disturbance reducing joule than PLEET.