Influence of diffusion and non-local radiation transport on the laser amplification of a He–Ne ring laser gyro

Macé, J.; Maynard, G.; Virdis, A.

doi:10.1088/0963-0252/23/4/045013

Cited by 3 publications

(3 citation statements)

References 57 publications

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“…J S Macé et al established a model of He-Ne plasma discharge and investigated the density distribution of excited state atoms in the anode column of the DC discharge. They found that both radiative and non-radiative diffusion of excited state atoms significantly affect the radial distribution of gain for laser modes [21]. However, the plasma dynamics and atomic state distribution under different He/Ne gas ratios conditions have seldom been studied.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios

Mao,

Hu,

et al. 2024

Photonics

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He-Ne lasers play a crucial role in ultra-precision measurement and optical sensing across various fields. For many applications based on He-Ne lasers, a higher output power is required to enhance the accuracy and signal-to-noise ratios of the associated optical measurements. However, conventional methods to increase the output power by reducing the diameter of the He-Ne laser discharge capillary inevitably result in higher diffraction losses and constrain the lasing performance. Here, we propose an approach to enhance laser pumping efficiency and output power through optimizing the ratios of He and Ne gasses. The validity of our proposal has been confirmed by both numerical simulations of He-Ne laser plasma discharge processes and experimental demonstrations, showing that the optimal gas ratio increases with the capillary diameter and total gas pressure.

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Section: Introductionmentioning

confidence: 99%

Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios

Mao,

Hu,

et al. 2024

Photonics

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“…Currently, two main classes of solution approaches are used. The first is based on Monte-Carlo methods [15][16][17][18][19][20][21][22][23][24][25][26]. The Monte-Carlo technique allows for the consideration of complex geometries and inhomogeneous distributions of absorbing atoms, as well as including the effects of partial frequency redistribution.…”

Section: Introductionmentioning

confidence: 99%

Ray tracing method for the description of radiation trapping in 3D plasma domains

Kalanov

Golubovskiǐ

Gortschakow

et al. 2017

J. Phys. D: Appl. Phys.

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A new approach for the solution of the Holstein-Biberman equation based on the advanced matrix method is developed. It allows for the consideration of radiation trapping in arbitrary finite 3D plasma domains for the various shapes of line contours and in a wide range of optical depths. Homogeneous and inhomogeneous distributions of absorbing atoms are considered. To solve the equation, an arbitrary plasma domain is discretized on a Cartesian voxel grid. The distances between the cells which are crossed by photons are computed by means of an efficient ray traversal algorithm. The algorithm is optimized for parallel computation on a graphical processing unit (GPU). For the Lorentzian shape of emission and absorption lines, the analytical expressions (which significantly decrease the computation time) have been derived. In the high opacity limit, the matrix is transformed to the universal form with an escape factor as a multiplier. The method is validated against a previously developed matrix approach by comparing the solutions for a finite cylinder geometry. The applicability range of the old method is specified. This range is defined by the asymptotics of Lorentz line wings at high optical depths. The capability of the method is illustrated with several complex geometries which are typical for various plasma sources. The effects related to the presence of photon blocking barriers are demonstrated. The proposed method allows for the demonstration of the fundamental differences between radiation and diffusion transport processes in the plasma domains of a complex shape. The method can be integrated into multi-component collisional-radiative models.

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“…Coupling constants were first introduced in [36] and they describe a probability that two arbitrary volume elements (cells) in plasma are connected due to the emission and absorption of a photon and account for the nonlocal photo-pumping of one plasma cell by another. The influence of the radiation transport on the laser amplification in the positive column of a low-pressure He-Ne DC discharge of a ring laser gyro has been studied in paper [39]. Review [40] describes the main features of the transport mechanisms of particles through the collisional diffusion and photons due to the radiation trapping in various problems of gas discharge physics.…”

Section: Introductionmentioning

confidence: 99%

Mutual influence of higher diffusion and radiation modes on the contraction of the positive column discharge

Golubovskiǐ

Siasko

Nekuchaev

2016

Plasma Sources Sci. Technol.

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Fourier analysis of various plasma components in contracted discharge is made by an expansion over diffusion and radiation modes. Resonance atoms transport is traditionally described by an approximation of the effective lifetime by Holstein which considers only a fundamental radiation mode. Proposed method makes it possible to estimate the role of resonance radiation transport quantitatively by comparing the mode spectra. Behavior of resonance atoms successively considered on simple three-level energy models in a linear Shottky theory and in a semi-analytical non-linear diffusion-recombination theory, describing a discharge contraction. Suggested Fourier analysis method has been applied to a detailed model of the DC column contraction in Argon glow discharge. An expansion of different plasma components (electron density, metastable and resonance atoms densities) over the corresponding orthonormal set of diffusion or radiation modes is performed. The comparison of spectra obtained using the traditional Holstein approximation and in case of accurate treatment of resonance radiation transport shows an increase of fundamental diffusion and radiation modes and an effect of higher harmonics suppression in the modes spectra when the resonance radiation transport is described precisely. The role of higher radiation modes in formation of radial profiles of the electron density, metastable and resonance atoms densities as well as current-voltage characteristics is demonstrated by specific examples.

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Influence of diffusion and non-local radiation transport on the laser amplification of a He–Ne ring laser gyro

Cited by 3 publications

References 57 publications

Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios

Analysis of Plasma Dynamics in He-Ne Lasers with Different Gas Ratios

Ray tracing method for the description of radiation trapping in 3D plasma domains

Mutual influence of higher diffusion and radiation modes on the contraction of the positive column discharge

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