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

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

Research output: Contribution to journalArticlepeer-review

5 Downloads (Pure)


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 languageEnglish
Pages (from-to)1183-1186
Number of pages4
JournalOptics Letters
Issue number5
Publication statusPublished - 2018 Mar 1

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


Dive into the research topics of 'Femtosecond two-photon-excited backward lasing of atomic hydrogen in a flame'. Together they form a unique fingerprint.

Cite this