The influence of and molecules on discharge equilibrium and F-atom production in a phototriggered HF laser using

Richeboeuf, Laurent; Pasquiers, S.; Legentil, M.; Puech, Vincent

doi:10.1088/0022-3727/31/4/007

Cited by 27 publications

(28 citation statements)

References 84 publications

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“…Abundant initial electrons obtained from strong UV pre-ionization. For the initial reduced electric field is stronger than the self-sustaining field of the discharge, the electron production rate by ionization is higher than the loss rate due to attachment, which is favorable for the development of a homogeneous discharge [8] . During the discharge process, the intensity of reduced electric field falling with drop of voltage.…”

Section: Resultsmentioning

confidence: 99%

Discharge pumped non-chain repetitively pulsed HF laser

Huang

Tang

et al. 2013

SPIE Proceedings

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The design and performance of a closed cycle, repetitively pulsed HF laser is described. The homogeneous glow discharge is formed with UV pre-ionization and transverse discharge structure. The optimal output parameters of single pulse operation are given by the investigation of discharge characteristics in SF 6 /C 2 H 6 gas mixture and output characteristics of laser pulse. The repetitively pulse energy stability of laser device are checked with different conditions of gas flowing velocity, charging voltage and total pressure of gas mixture. It is shown that the maximal output energy of laser pulse of 0.6J, peak power 3MW are obtained. Total efficiency of laser device is about 2.4%. When the gas mixture circulating with 4m/s flowing velocity, the maximal running frequency of 50Hz are obtained and operating stability keep well. Under these conditions, the laser pulse energy keeps stable and the average output power is 18W.

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Section: Resultsmentioning

confidence: 99%

Discharge pumped non-chain repetitively pulsed HF laser

Huang

Tang

et al. 2013

SPIE Proceedings

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“…It is satisfactorily fitted by the linear function N S ϭa ϩbW sp E qs , where the constant b is in turn a function of the state of the cathode surface and of the hydrocarbon content in the mixture. 36 A conclusion important for further interpretation of the mechanisms of the development of a SIVD follows from Figs. 11 and 12: the volume occupied by the discharge increases with an increase in the amount of energy injected into the plasma and almost in proportion to the energy.…”

Section: Methodsmentioning

confidence: 94%

“…35 These investigations made it possible to increase the aperture of a nonchain HF͑DF͒ laser based on SF 6 -hydrocarbon ͑deuterocarbon͒ mixtures up to 27 cm, and to obtain a radiation energy of ϳ400 J for an electric efficiency of approximately 4%. 36 A SSVD without preionization in SF 6 and in mixtures that contain it, i.e., a self-initiated volume discharge ͑SIVD͒, 37 has a number of unusual properties for volume discharges. The observation of a discharge of this kind opens unique opportunities for the development of simple and effective nonchain HF͑DF͒ lasers that operate in both pulsed and repetitively pulsed regimes.…”

Section: Introductionmentioning

confidence: 99%

High-power self-controlled volume-discharge-based molecular lasers

Аполлонов

2004

Opt. Eng

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An investigation is made of the characteristics of the formation of a self-controlled volume discharge for pumping CO 2 lasers, i.e., self-sustained volume discharge (SSVD), which involves the preliminary filling of a discharge gap by an electron flux from an auxiliary discharge plasma. It is determined that this method is suitable for large interelectrode gaps, that distortion of the electric field in the gap by the space charge of the electron flux plays an important role in the formation of the discharge, that the electrodes could be profiled dynamically during propagation of an electron flux through the discharge gap, and a SSVD could form in systems with a strongly inhomogeneous field. High-power SSVD-based CO 2 laser systems are created and investigated. Another type of self-controlled volume discharge without preionization, i.e., a selfinitiated volume discharge (SIVD), in nonchain HF lasers with SF 6 -C 2 H 6 mixtures is also investigated. It is 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 field by means of the successive formation of overlapping diffuse channels under a discharge voltage close to its quasi-steady-state value. As new channels appear, the current that flows through the channels formed earlier decreases. The volume occupied by the SIVD increases when the energy deposited in the plasma increases, and, when the discharge volume is confined by a dielectric surface, the discharge voltage increases simultaneously when the current increases. The possible mechanisms that explain the observed phenomena, namely the dissociation and electron attachment of SF 6 molecules, are examined. A simple analytical model is developed that makes it possible to describe these mechanisms at a qualitative level. High-power SIVD-based HF(DF) lasers are developed and tested.

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“…12. It is satisfactorily¯tted by the linear function N S = a + bW sp E qs , in which the constant b is in its turn a function of the state of the cathode surface and of the hydrocarbon content in the mixture [39].…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…These investigations made it possible to increase the aperture of a nonchain HF(DF) laser based on SF 6 -hydrocarbon (deuterocarbon) mixtures up to 27 cm and to obtain a radiation energy of ¹ 400 J for an electric e±ciency of approximately 4% [39].…”

Section: Introductionmentioning

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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The influence of and molecules on discharge equilibrium and F-atom production in a phototriggered HF laser using

Cited by 27 publications

References 84 publications

Discharge pumped non-chain repetitively pulsed HF laser

Discharge pumped non-chain repetitively pulsed HF laser

High-power self-controlled volume-discharge-based molecular lasers

High power self-controled volume discharge based molecular lasers

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