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

Ding, Pengji LU ; 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
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
  • 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
2019-06-11 04:05:02
@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          = {http://dx.doi.org/10.1364/OL.44.002374},
  volume       = {44},
  year         = {2019},
}