Efficient N2 laser pumped by nanosecond diffuse discharge

Панченко, А. Н.; Тарасенко, В. Ф.; Ломаев, М. И.; Panchenko, N A; Suslov, A. I.

doi:10.1016/j.optcom.2018.08.014

Cited by 8 publications

(5 citation statements)

References 53 publications

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“…Thus, short high-voltage pulses were applied to the gaps, providing a sharply inhomogeneous electric field near electrodes. With a high degree of probability, it can be concluded that in the above references, runaway electrons could appear and, similarly to [9][10][11][12][13][14], provide preionization and diffuse discharge formation.…”

Section: Hydrogen Lasermentioning

confidence: 94%

“…The installation drawing is shown in figure 1. A laser chamber with two stainless steel electrodes 30 cm long placed at a distance of 1.8 cm and connected to a RADAN-220 pulse generator, described in detail in [14], was used in our experiments. The maximum energy E stored in the generator forming line with a capacity of C = 50 pF [15] was 2.1 J.…”

Section: Experimental Equipment and Measurement Techniquesmentioning

confidence: 99%

“…The electrodes were made in the form of blades with rounded edges, had a vertex angle of 5 • and a radius of curvature of the sharp edges of 0.05 mm. This provided increased electric field strength near the electrodes and generation of fast and runaway electrons, as well as x-ray radiation, which made it possible to form volume diffuse discharge in various highpressure gas mixtures [9,13,14].…”

Section: Experimental Equipment and Measurement Techniquesmentioning

confidence: 99%

“…An integrated photograph of the glow in the gap is shown in figure 2, while spontaneous emission spectra of the diffuse discharges in pure H 2 and its mixtures with some rare gases are shown in figure 3. The discharge, similarly to [13,14], has a weakly luminous form in the visible spectral range diffuse channels, starting from bright spots on the edge of the blade electrodes and then quickly expanding toward the middle of the gap, forming a glow without any signs of arc channels. The number of spots increases, while the width of the jets reduces with the gas pressure.…”

Section: Hydrogen Lasermentioning

confidence: 99%

“…As the ionization waves approach each other near the gap center, an increase in the electric field occurs in the region between them. The field enhancement made it possible to obtain, from the central part of the gap, UV lasing on the second positive nitrogen system (λ = 337.1 nm) in pressured nitrogen and on the first negative one (λ = 428 nm) in a He-N 2 mixture using the laser device with blade electrodes [13,14].…”

Section: Vuv Fluorine Molecular Lasermentioning

confidence: 99%

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VUV lasing in diffuse discharges formed by runaway electrons

Panchenko,

Tarasenko,

Kozevnikov

2023

Laser Phys.

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The parameters of stimulated emission in diffuse discharges formed in a sharply inhomogeneous electric field by runaway electrons in mixtures of rare gases with the addition of H2 and F2 at pressures up to 10 atm are studied. Efficient VUV lasing was obtained at wavelengths from 148 to 193 nm on the transitions of H2, F2 and exciplex ArF* molecules. It was shown that the addition of He buffer gas increases the pulse duration, while Ne addition improves the output energy of the VUV laser on the H2 Lyman band. A laser pulse duration over 10 ns and an output of 0.12 mJ were obtained. The diffuse discharge in mixtures of He with F2 was found to form as a result of successive ionization waves. It was shown that the laser pulse at 157 nm has three peaks, which correspond to the maxima of the diffuse discharge current. Therewith, the first or second peak of the laser radiation has the maximum intensity, depending on the amplitude of the conduction current in the primary ionization wave. A maximal F2* laser electrical efficiency of η 0 = 0.18% and an output of Q 157 = 3.8 mJ were obtained in a He–F2 gas mixture at pressure of 10 atm, which exceeds the efficiency of lasers of this type pumped by transverse volume discharges with UV preionization. Long-pulse operation of the ArF* laser was achieved in a He–Ne–Ar–F2 gas mixture. Lasing at 193 nm continued during two periods of the diffuse discharge current. The total duration of the laser pulse was as long as 40 ns, and the radiation energy at 193 nm was as high as 2 mJ from an active volume of 20 cm3.

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