Femtosecond two-photon-excited backward lasing of atomic hydrogen in a flame

Pengji Ding; Maria Ruchkina; L. I.U. Yi; Marcus Alden; Joakim Bood

doi:10.1364/OL.43.001183

Femtosecond two-photon-excited backward lasing of atomic hydrogen in a flame

Pengji Ding, Maria Ruchkina, L. I.U. Yi, Marcus Alden, Joakim Bood

Department of Physics

University of Shanghai for Science and Technology

Research output: Contribution to journal › Article › peer-review

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Abstract

We report on an observation of bi-directional 656 nm lasing action of atomic hydrogen in a premixed CH₄∕air flame induced by resonant femtosecond 205 nm two-photon excitation. In particular, the backward-propagating lasing pulse is characterized in the spatial and temporal domains for the sake of a single-ended diagnostic. Its picosecond-scale duration and smooth temporal profile enable spatially resolved detection of hydrogen atoms in the millimeter range, which is successfully demonstrated using two narrow welding flames.

Original language	English
Pages (from-to)	1183-1186
Number of pages	4
Journal	Optics Letters
Volume	43
Issue number	5
DOIs	https://doi.org/10.1364/OL.43.001183
Publication status	Published - 2018 Mar 1

Subject classification (UKÄ)

Atom and Molecular Physics and Optics

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10.1364/OL.43.001183

ol-43-5-1183Final published version, 1.82 MBLicence: CC BY

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abstract = "We report on an observation of bi-directional 656 nm lasing action of atomic hydrogen in a premixed CH4∕air flame induced by resonant femtosecond 205 nm two-photon excitation. In particular, the backward-propagating lasing pulse is characterized in the spatial and temporal domains for the sake of a single-ended diagnostic. Its picosecond-scale duration and smooth temporal profile enable spatially resolved detection of hydrogen atoms in the millimeter range, which is successfully demonstrated using two narrow welding flames.",

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AU - Bood, Joakim

PY - 2018/3/1

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N2 - We report on an observation of bi-directional 656 nm lasing action of atomic hydrogen in a premixed CH4∕air flame induced by resonant femtosecond 205 nm two-photon excitation. In particular, the backward-propagating lasing pulse is characterized in the spatial and temporal domains for the sake of a single-ended diagnostic. Its picosecond-scale duration and smooth temporal profile enable spatially resolved detection of hydrogen atoms in the millimeter range, which is successfully demonstrated using two narrow welding flames.

AB - We report on an observation of bi-directional 656 nm lasing action of atomic hydrogen in a premixed CH4∕air flame induced by resonant femtosecond 205 nm two-photon excitation. In particular, the backward-propagating lasing pulse is characterized in the spatial and temporal domains for the sake of a single-ended diagnostic. Its picosecond-scale duration and smooth temporal profile enable spatially resolved detection of hydrogen atoms in the millimeter range, which is successfully demonstrated using two narrow welding flames.

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Femtosecond two-photon-excited backward lasing of atomic hydrogen in a flame

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Nonlinear optical techniques for ultrafast laser diagnostics: Development of femtosecond LIF, LIGS, CARS and backward lasing

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