Measurement of the gain of an ultraviolet nitrogen laser

Papakin, V. F.; Sonin, A. Yu.

doi:10.1070/qe1985v015n04abeh007007

Cited by 9 publications

(3 citation statements)

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“…(21) and (22), N gas is the ground-state gas density; r C and r B are the electron impact cross-sections of the N 2 (C) and N 2 (B) states, respectively; gðT e ; vÞ is the normalized Maxwell-Boltzmann distribution; r stim is the stimulated emission cross-section and is given by k 2 =8pDms C % 4:5 Â 10 À15 cm 2 for Dm ¼ 278 GHz [23]; s C and s B (40 ns and 6 ls, respectively) are the spontaneous lifetime of the C and B laser levels; s ph represents the mean cavity lifetime; c is the geometrical factor for spontaneous emission; and V dis ¼ sd AMP l AMP is the discharge volume.…”

Section: Rate Equationsmentioning

confidence: 99%

Nitrogen lasers, optical devices of variable gain coefficient: Theoretical considerations

Sarikhani

Hariri

2010

Optics Communications

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Section: Rate Equationsmentioning

confidence: 99%

Nitrogen lasers, optical devices of variable gain coefficient: Theoretical considerations

Sarikhani

Hariri

2010

Optics Communications

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“…is Einstein's coefficient for stimulated emission, λ and ν are the lasing wavelength and frequency, c is the speed of light, τ s is the spontaneous emission decay time and Δν is the line width for a collisionally broadened spectral line of the C-B transition (we use Δν = 0.1 nm for normal pressure, as measured in [34], and scale this value proportionally to pressure). The second summand on the right side is a spontaneous emission source.…”

Section: Model For a Single-pass Nitrogen Lasermentioning

confidence: 99%

Theory of a filament initiated nitrogen laser

Kartashov

Ališauskas

Pugžlys

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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We present the theoretical model for a single-pass, discharge-type standoff nitrogen laser initiated by a femtosecond filament in nitrogen gas. The model is based on the numerical solution of the kinetic equation for the electron energy distribution function self-consistently with balance equations for nitrogen species and laser equations. We identify the kinetic mechanisms responsible for a buildup of population inversion in the filament afterglow plasma and determine the dependence of population inversion density and the parameters of nitrogen lasing at a 337 nm wavelength corresponding to the transition between the C3Πu (v = 0) excited and the X1Σg (v = 0) ground electronic states in a nitrogen molecule on the polarization and wavelength of the driver laser pulse used to produce the filament. We show that population inversion is achieved on an ultrafast time scale of ≈10 ps and decays within the time: <100 ps. We derive the low-signal gain 2.2 cm−1 for lasing from a circularly polarized 0.8 μm near-IR filament and 0.16 cm−1 for a linearly polarized 4 μm mid-IR filament. The results of the numerical simulations demonstrate good quantitative agreement with the experimental measurements.

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“…9 In TE N 2 lasers, with just two exceptions, 3,4 it was found that the plot of g 0 parameter versus the discharge length is following a characteristic curve. 7 In all the measurements that have been reported so far, the laser electrodes have been fixed at some constant values, and in some studies with oscillator-amplifier ͑OSC-AMP͒ configurations, the laser systems were made to operate either at an atmospheric gas pressure, p AMP , of 760 Torr for the AMP, 6 or at most the laser was operating at two different AMP gas pressures, where it resulted in ⌬g 0 / ⌬p AMP = −9.5 ϫ 10 −4 cm −1 Torr −1 , and ⌬E s / ⌬p AMP = 1.63 J cm −2 Torr −1 . 9 There are only two reports where special attention has been paid for the TE-N 2 laser behavioral characteristics.…”

Section: Introductionmentioning

confidence: 99%