Abstract

Two-photon-absorption laser-induced fluorescence of Kr was explored using both nanosecond- and femtosecond-duration laser excitation sources. Fluorescence signals following two-photon excitation at two wavelengths (212.56 nm and 214.77 nm) were compared while varying laser pulse duration, energy, and excitation wavelength as well as pressure and Kr mole fraction in mixtures with nitrogen. Our findings show that stronger fluorescence was observed when the excitation wavelength was tuned to 212.56 nm, regardless of the excitation-pulse duration. Moreover, an approximate 100-fold signal enhancement from nanosecond excitation ($\sim 3\mathrm{mJ}/\text{pulse}$, 10 ns duration) was observed as compared to femtosecond excitation ($\sim 6\mathrm{\mu J}/\text{pulse}$, 90 fs duration).

© 2019 Optical Society of America

100 kHz krypton-based flow tagging velocimetry in a high-speed flow

Stephen W. Grib, Naibo Jiang, Paul S. Hsu, Hans U. Stauffer, Josef J. Felver, Sukesh Roy, and S. Alexander Schumaker
Appl. Opt. 60(6) 1615-1622 (2021)

Spectroscopic investigation of high-pressure femtosecond two-photon laser-induced fluorescence of carbon monoxide up to 20 bar

Yejun Wang and Waruna D. Kulatilaka
Appl. Opt. 58(10) C23-C29 (2019)

Comparison of nanosecond and picosecond excitation for interference-free two-photon laser-induced fluorescence detection of atomic hydrogen in flames

Waruna D. Kulatilaka, Brian D. Patterson, Jonathan H. Frank, and Thomas B. Settersten
Appl. Opt. 47(26) 4672-4683 (2008)

High-repetition-rate krypton tagging velocimetry in Mach-6 hypersonic flows

Naibo Jiang, Stephen W. Grib, Paul S. Hsu, Matthew Borg, S. Alexander Schumaker, and Sukesh Roy
Appl. Opt. 61(9) 2192-2197 (2022)

Comparison of nanosecond and picosecond excitation for two-photon laser-induced fluorescence imaging of atomic oxygen in flames

Jonathan H. Frank, Xiangling Chen, Brian D. Patterson, and Thomas B. Settersten
Appl. Opt. 43(12) 2588-2597 (2004)