Gain mechanism of femtosecond two-photon-excited lasing effect in atomic hydrogen

Pengji Ding, Maria Ruchkina, Yi Liu, Marcus Alden, Joakim Bood

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

6 Citeringar (SciVal)
37 Nedladdningar (Pure)


By aiming to establish single-ended standoff combustion diagnostics, bidirectional lasing emissions of atomic hydrogen at 656 nm wavelength have been generated via two-photon resonant excitation by focusing 205 nm femtosecond laser pulses into a premixed CH4/O2 flame. The forward lasing strength is approximately one order of magnitude stronger than that of the backward one, due to the geometry of traveling wave excitation over a 2-mm-long pencil-shaped gain volume and the short gain lifetime of 3.5 ps. The gain coefficient of hydrogen lasing was determined to approximate 52/cm. As for the underlying physics of hydrogen lasing, amplified spontaneous emission (ASE) occurs simultaneously with four-wave mixing (FWM), and ASE dominates in the forward direction, whereas the backward lasing is virtually only ASE.

Sidor (från-till)2374-2377
Antal sidor4
TidskriftOptics Letters
StatusPublished - 2019 maj 1

Ämnesklassifikation (UKÄ)

  • Atom- och molekylfysik och optik


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