Nitrogen lasers

Kunabenchi, R. S.; Gorbal, M. R.; Savadatti, M. I.

doi:10.1016/0079-6727(84)90027-2

Cited by 35 publications

(11 citation statements)

References 249 publications

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“…. This is actually the main reaction responsible for population inversion in a traditional N 2 laser, where the electrons are accelerated to obtain sufficient energy by the discharge electric field [15]. The cross section of the above reaction is sensitive to the kinetic energy of the incident electron.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

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Backward stimulated radiation from filaments in nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses

Mitryukovskiy¹,

Liu²,

Ding³

et al. 2014

Opt. Express

120

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We report on strong backward stimulated emission at 337 nm in Nitrogen gas pumped by circularly polarized femtosecond laser pulses at 800 nm. A distinct dependence of the backward UV spectrum on pump laser polarization and intensity is observed, pointing to the occurrence of backward amplified spontaneous emission inside filaments. We attribute the population inversion to inelastic collision between the free electrons produced by the pump laser and neutral N 2 molecules. The addition of Oxygen molecules is detrimental for the gain, reducing it to near threshold at atmospheric concentration.

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Section: Discussion Of Resultsmentioning

confidence: 99%

“…The detrimental influence of Oxygen molecule for the conventional discharge-pumped Nitrogen laser is well documented [15]. The underlying physical mechanism is attributed to the collision reaction , which efficiently reduces the population density in the upper state of the lasing emission.…”

Section: Backward Emission From Filaments In Ambient Airmentioning

confidence: 99%

Backward stimulated radiation from filaments in nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses

Mitryukovskiy¹,

Liu²,

Ding³

et al. 2014

Opt. Express

120

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“…In this lasing process, the electronic transitions of nitrogen are the same as in the conventional discharge-pumped nitrogen laser [17]. However, the physics behind the population inversion in our situation is substantially different.…”

Section: Introductionmentioning

confidence: 93%

Free-space nitrogen gas laser driven by a femtosecond filament

et al. 2012

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We report an experimental proof and full characterization of laser generation in molecular nitrogen in an argon-nitrogen gas mixture remotely excited at a distance above 2 m in a femtosecond laser filament. Filamentation experiments performed with near-infrared, 1-μm-wavelength and midinfrared, 4-μm-wavelength short-pulse laser sources show that mid-IR laser pulses enable radical enhancement of filamentation-assisted lasing by N 2 molecules. Energies as high as 3.5 μJ are achieved for the 337-and 357-nm laser pulses generated through the second-positive-band transitions of N 2 , corresponding to a 0.5% total conversion efficiency from midinfrared laser energy to the energy of UV lasing.

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“…C 3 Π u → B 3 Π g . The population inversion mechanism between the C 3 Π u and B 3 Π g states was attributed to the traditional Bennet mechanism, where collisions transfer the excitation energy of argon atoms to molecular nitrogen [18]. Unfortunately, this method cannot be applied for remote generation of backward lasing emission because of its requirement of high pressure argon gas (p > 3 bar).…”

Section: Introductionmentioning

confidence: 99%

Backward Lasing of Air plasma pumped by Circularly polarized femtosecond pulses for the saKe of remote sensing (BLACK)

Ding¹,

Mitryukovskiy²,

Houard³

et al. 2014

Opt. Express

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Recently, S. Mitryukovskiy et al. presented experimental evidence showing that backward Amplified Spontaneous Emission (ASE) at 337 nm can be obtained from plasma filaments in nitrogen gas pumped by circularly polarized 800 nm femtosecond pulses (Opt. Express, 22, 12750 (2014)). Here, we report that a seed pulse injected in the backward direction can be amplified by ~200 times inside this plasma amplifier. The amplified 337 nm radiation can be either linearly or circularly polarized, dictated by the seeding pulse, which is distinct from the non-polarized nature of the ASE. We performed comprehensive measurements of the spatial profile, optical gain dynamics, and seed pulse energy dependence of this amplification process. These measurements allow us to deduce the pulse duration of the ASE and the amplified 337 nm radiation as well as the corresponding laser intensity inside the plasma amplifier. It indicates that the amplification is largely in the unsaturated regime and that further improvement of laser energy is possible. Moreover, we observed optical gain in plasma created in ambient air. This represents an important step towards future applications exploiting backward lasing for remote atmospheric sensing.

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Nitrogen lasers

Cited by 35 publications

References 249 publications

Backward stimulated radiation from filaments in nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses

Backward stimulated radiation from filaments in nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses

Free-space nitrogen gas laser driven by a femtosecond filament

Backward Lasing of Air plasma pumped by Circularly polarized femtosecond pulses for the saKe of remote sensing (BLACK)

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