Abstract

Quantitative femtosecond two-photon laser-induced fluorescence of atomic oxygen was demonstrated in an ${\mathrm{H}}_2/\text{air}$ flame at pressures up to 10 atm. Femtosecond excitation at 226.1 nm was used to pump the $3p{{}^{3}P}_{J^{\prime }=0,1,2}\leftarrow \leftarrow 2p{{}^{3}P}_{J^{\prime \prime }=0,1,2}$ electronic transition of atomic oxygen. Contributions from multiphoton de-excitation, production of atomic oxygen, and photolytic interferences were investigated and minimized by limiting the laser irradiance to $\sim {10}^{11}\mathrm{W}/{\mathrm{cm}}^2$. Quantitative agreement was achieved with the theoretical equilibrium mole fraction of atomic oxygen over a wide range of fuel–air ratios and pressures in an ${\mathrm{H}}_2/\text{air}$ laminar calibration burner.

© 2019 Optical Society of America

Femtosecond, two-photon, laser-induced fluorescence (TP-LIF) measurement of CO in high-pressure flames

K. Arafat Rahman, Karna S. Patel, Mikhail N. Slipchenko, Terrence R. Meyer, Zhili Zhang, Yue Wu, James R. Gord, and Sukesh Roy
Appl. Opt. 57(20) 5666-5671 (2018)

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)

Pressure-scaling characteristics of femtosecond two-photon laser-induced fluorescence of carbon monoxide

K. Arafat Rahman, Venkat Athmanathan, Mikhail N. Slipchenko, Terrence R. Meyer, and Sukesh Roy
Appl. Opt. 58(27) 7458-7465 (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)

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)