Plasma-sheet CO<sub>2</sub>laser

Andreev, S. I.; Белоусова, И. М.; Dashuk, P. N.; Zaroslov, D Yu; Zobov, E. A.; Karlov, N. V.; Kuzmin, G. P.; Никифоров, С. М.; Prokhorov, A M

doi:10.1070/qe1976v006n08abeh011788

Cited by 17 publications

(3 citation statements)

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“…In the last twenty years different researchers [28][29][30][31][32][33][34] were interested by a discharge in a configuration with some similarities with the one we consider here. Their goal was to obtain a uniform high current surface discharge at moderate voltages for gas-lasers use.…”

Section: Physical Interpretation Of the Electrical Resultsmentioning

confidence: 99%

Flow Control with Electrohydrodynamic Actuators

Artana¹,

D’Adamo²,

Léger³

et al. 2002

AIAA Journal

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This work analyses the ability of an electrohydrodynamic actuator to modify the characteristics of a flow over a flat plate. The device considered uses flush mounted electrodes and a d.c. power supply to create a plasma sheet on the surface of the plate. We analyze the mechanism of formation of this plasma sheet, which is shown to be similar to the streamer formation. We show flow visualizations at low flow velocities (≈1m/s) and results from Particle Image Velocimetry at higher flow velocities (range 11.0-17.5 m/s). These results show that the discharge can induce an important acceleration of the flow close to the surface.

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Section: Physical Interpretation Of the Electrical Resultsmentioning

confidence: 99%

Flow Control with Electrohydrodynamic Actuators

Artana¹,

D’Adamo²,

Léger³

et al. 2002

AIAA Journal

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“…When the auxiliary discharge pulse was shortened (by reducing the inductance or the active resistance in the circuit of this discharge), the contribution of the photoionization to the discharge-gap conductance increased and, in principle, it was possible to form an electron°ux from a plasma created by the ultraviolet radiation of the auxiliary discharge in the cathode region (and also from a plasma on the surface of a plasma cathode [30] or a barrier discharge plasma in systems described in Ref. [16]) As already pointed out, the homogeneity of a SSVD could be improved by selecting the auxiliary discharge characteristics in such a way as to satisfy the condition (9).…”

Section: Discussionmentioning

confidence: 99%

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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“…More radical but less developed alternatives include electrical discharge pumping with which Wong and Beverley (1977) demonstrated laser action, electron-beam pumping and the use of Hg discharge lamps discussed by Hohla et al (1977) and chemical pumping investigated by Andreev et al(1976).…”

Section: Principle Of Operationmentioning

confidence: 99%