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

Ding, Pengji LU orcid ; Ruchkina, Maria LU ; Liu, Yi ; Alden, Marcus LU and Bood, Joakim LU (2019) In Optics Letters 44(9). p.2374-2377
Abstract

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... (More)

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.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Letters
volume
44
issue
9
pages
4 pages
publisher
Optical Society of America
external identifiers
  • pmid:31042226
  • scopus:85065503545
ISSN
1539-4794
DOI
10.1364/OL.44.002374
language
English
LU publication?
yes
id
3d00fc4c-6f02-4553-af6b-d86b0acc0bf8
date added to LUP
2019-05-20 09:33:38
date last changed
2024-01-30 17:18:17
@article{3d00fc4c-6f02-4553-af6b-d86b0acc0bf8,
  abstract     = {{<p>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.</p>}},
  author       = {{Ding, Pengji and Ruchkina, Maria and Liu, Yi and Alden, Marcus and Bood, Joakim}},
  issn         = {{1539-4794}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{9}},
  pages        = {{2374--2377}},
  publisher    = {{Optical Society of America}},
  series       = {{Optics Letters}},
  title        = {{Gain mechanism of femtosecond two-photon-excited lasing effect in atomic hydrogen}},
  url          = {{https://lup.lub.lu.se/search/files/83040308/Paper_Gain_mechanism_of_fs_2_photon_excited_lasing_effect_in_atomic_hydrogen_Ding_et_al_2019_.pdf}},
  doi          = {{10.1364/OL.44.002374}},
  volume       = {{44}},
  year         = {{2019}},
}