Gain mechanism of femtosecond two-photon-excited lasing effect in atomic hydrogen
(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
- Ding, Pengji LU ; Ruchkina, Maria LU ; Liu, Yi ; Alden, Marcus LU and Bood, Joakim LU
- organization
- publishing date
- 2019-05-01
- 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
- pmid:31042226
- 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
- 2024-04-16 06:25:31
@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}}, }