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Nonadiabaticity of cavity-free neutral nitrogen lasing

Ding, Pengji LU ; Escudero, Juan Carlos; Houard, Aurélien; Sanchis, Alberto; Díaz Vera, Javier E.; Vicéns, Sergio; Liu, Yi and Oliva, Eduardo (2017) In Physical Review A 96(3).
Abstract

We report on a theoretical study of cavity-free lasing of neutral nitrogen molecules in femtosecond laser filaments with a nonadiabatic Maxwell-Bloch model, compared with recent pump-seed experiments. The nonadiabaticity of the lasing process is revealed and it is found that electron-neutral collisions dominate the dipole dephasing rate. Moreover, we show that the asymmetry between forward and backward lasing not only depends on the different amplification lengths but also on the temporal dynamics of electron-neutral collisions. The comparison of the nonadiabatic model with simulations based on the adiabatic approximation (such as radiative transfer equations) explicitly sets a bound on the validity of the latter model for cavity-free... (More)

We report on a theoretical study of cavity-free lasing of neutral nitrogen molecules in femtosecond laser filaments with a nonadiabatic Maxwell-Bloch model, compared with recent pump-seed experiments. The nonadiabaticity of the lasing process is revealed and it is found that electron-neutral collisions dominate the dipole dephasing rate. Moreover, we show that the asymmetry between forward and backward lasing not only depends on the different amplification lengths but also on the temporal dynamics of electron-neutral collisions. The comparison of the nonadiabatic model with simulations based on the adiabatic approximation (such as radiative transfer equations) explicitly sets a bound on the validity of the latter model for cavity-free nitrogen lasing phenomenon, which holds a unique potential in optical remote sensing applications.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
96
issue
3
publisher
American Physical Society (APS)
external identifiers
  • scopus:85029591608
  • wos:000409557000008
ISSN
2469-9926
DOI
10.1103/PhysRevA.96.033810
language
English
LU publication?
yes
id
a6b9a848-6359-4a39-a090-ee225bf98144
date added to LUP
2017-10-02 12:21:12
date last changed
2018-03-11 04:43:48
@article{a6b9a848-6359-4a39-a090-ee225bf98144,
  abstract     = {<p>We report on a theoretical study of cavity-free lasing of neutral nitrogen molecules in femtosecond laser filaments with a nonadiabatic Maxwell-Bloch model, compared with recent pump-seed experiments. The nonadiabaticity of the lasing process is revealed and it is found that electron-neutral collisions dominate the dipole dephasing rate. Moreover, we show that the asymmetry between forward and backward lasing not only depends on the different amplification lengths but also on the temporal dynamics of electron-neutral collisions. The comparison of the nonadiabatic model with simulations based on the adiabatic approximation (such as radiative transfer equations) explicitly sets a bound on the validity of the latter model for cavity-free nitrogen lasing phenomenon, which holds a unique potential in optical remote sensing applications.</p>},
  articleno    = {033810},
  author       = {Ding, Pengji and Escudero, Juan Carlos and Houard, Aurélien and Sanchis, Alberto and Díaz Vera, Javier E. and Vicéns, Sergio and Liu, Yi and Oliva, Eduardo},
  issn         = {2469-9926},
  language     = {eng},
  month        = {09},
  number       = {3},
  publisher    = {American Physical Society (APS)},
  series       = {Physical Review A},
  title        = {Nonadiabaticity of cavity-free neutral nitrogen lasing},
  url          = {http://dx.doi.org/10.1103/PhysRevA.96.033810},
  volume       = {96},
  year         = {2017},
}