Electric-discharge SF<sub>6</sub>–H<sub>2</sub>laser pumped by an inductive storage unit

Zapol'skiĭ, A F; Yushko, K. B.

doi:10.1070/qe1979v009n02abeh008755

Cited by 5 publications

(3 citation statements)

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“…However, the calculated oscillograms in Ref. [40] do not agree with the experimental ones. We are not aware of other studies in which a similar form of the discharge voltage was observed in SF 6 and in mixtures based on it.…”

Section: Experimental Apparatusmentioning

confidence: 54%

“…The current amplitude also diminishes, whereas the voltage is appreciably higher at its maximum than in the case of an 'uncon¯ned' discharge. Voltage oscillograms of a similar type are obtained when the discharge characteristics are calculated taking into account the attachment of electrons to vibrationally excited SF 6 molecules [40]. However, the calculated oscillograms in Ref.…”

Section: Experimental Apparatusmentioning

confidence: 98%

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High power self-controled volume discharge based molecular lasers

Аполлонов¹

2003

Open Physics

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An investigation was made of the characteristics of the formation of a selfcontroled volume discharge for the pumping of CO 2 lasers, i.e. self-sustained volume discharge (SSVD), which involved a preliminary lling of a discharge gap by an electron ®ux from an auxiliary-discharge plasma. We have found that this method was suitable for large interelectrode gaps, that distortion of the electric eld in the gap by the space charge of the electron ®ux played an important role in the formation of the discharge and that the electrodes could be pro led dynamically during propagation of an electron ®ux through the discharge gap and a SSVD could form in systems with a strongly inhomogeneous eld. High power SSVD based CO2 laser systems have been created and investigated. Another type of self-controled volume discharge without pre-ionization, i.e. a selfinitiated volume discharge (SIVD), in nonchain HF lasers with SF 6 -C 2 H 6 mixtures was investigated as well in our review. We have established that, after the primary local electrical breakdown of the discharge gap, the SIVD spreads along the gap in directions perpendicular to that of the electric eld by means of the successive formation of overlapping di¬use channels under a discharge voltage close to its quasi-steady state value. It is shown that, as new channels appear, the current ®owing through the channels formed earlier decreases. The volume occupied by the SIVD increases with increase in the energy deposited in the plasma and, when the discharge volume is con ned by a dielectric surface, the discharge voltage increases simultaneously with increase in the current. The possible mechanisms which explain the observed phenomena, namely the dissociation of SF 6 molecules and electron attachment SF 6 molecules, are examined. A simple analytical model, which makes it possible to describe these mechanisms at a qualitative level, was developed. High power SIVD based HF(DF) lasers have been developed and tested. c ® Central European Science Journals. All rights reserved.Keywords: Lasers, plasma, discharge PACS: 42.55. Ks, 52.80

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Section: Experimental Apparatusmentioning

confidence: 54%

Section: Experimental Apparatusmentioning

confidence: 98%

High power self-controled volume discharge based molecular lasers

Аполлонов¹

2003

Open Physics

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“…At W,>'O.O5J/cm3, surface density of cathode spots has a maximum in the central zone ofthe cathode as in an ordinary gap with plane electrodes not bounded by a dielectric surface. However no interpretation was given by the authors in [10]. Because the whole discharge chamber was occupied by the discharge, the above evidence suggests that an effective ionization coefficient in the gas mixture formed due to the dissociation of the starting components is lower than in an initial mixture.…”

Section: Resultsmentioning

confidence: 86%

Self-initiated volume discharge in mixtures of SF 6 with hydrocarbons to excite nonchain hf lasers

Аполлонов

Belevtsev

Firsov

et al. 2000

International Conference on Atomic and Molecular Pulsed Lasers III

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The paper studies a self-sustained volume discharge without preionization-self-initiated volume discharge (SIVD)-to excite non-chain HF lasers on SF6-C2H mixtures. Once initiated by a local discharge gap breakdown, SIVD is found to propagate then over the whole gap normally to the applied electric field through successively starting diffuse overlapping channels at a voltage close to the quasi-stationaiy value. With forming new channels, the current through those previously originated decreases. The volume occupied by SIVD tends to expand with increasing the energy released within the discharge plasma, whereas a discharge bounded by a dielectric surface shows a simultaneous increase both in burning voltage and current. All these features combined allow a concept to be put forward of the existence of certain restriction mechanisms depending on the specific energy released and not permitting the total deposited energy to pass through a single channel. It is suggested that SF6 dissociation by electron impact and the electron attachment to vibrarionally excited SF6 molecules are just those mechanisms. Simple analytical models have been developed allowing these mechanisms to be qualitatively described.

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