Highly efficient gas lasers with a three-electrode double discharge

Borovkov, V. V.; Воронин, В. В.; Voronov, S. L.; Zenkov, D. I.; Lazhintsev, B V; Nor-Arevyan, V A; Tananakin, V.A.; Fedorov, G I

doi:10.1070/qe1996v026n01abeh000582

Cited by 4 publications

(6 citation statements)

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“…For this output coupler reflectivity, the laser pulse duration decreases to 117 ns. Still, this pulse duration is almost 20% longer compared to other large volume KrCl lasers [15]. We have found in similar experiments that the pulse energy decreased strongly for R OC = 0.5 or below.…”

Section: 2supporting

confidence: 64%

“…Therefore, no additional elements are required and the circuit inductance can be minimized to the intrinsic rest selfinductance given by the laser geometry. Borovkov et al have demonstrated a KrCl three-electrode laser with an efficiency of 0.5% and a laser pulse energy of 0.25 J [15]. However, no information about the power deposition, the laser pulse duration or the discharge homogeneity has been given.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these limitations set by magnetic switches, we employ a three-electrode discharge circuit [13][14][15] to pump a high-pressure KrCl laser. In this laser, two discharge volumes are formed by using three electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Long-pulse KrCl laser with a high discharge quality

et al. 2007

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The discharge quality and optimum pump parameters of a long-pulse high-pressure gas discharge excited KrCl laser are investigated. A three-electrode prepulse-mainpulse excitation circuit is employed as pump source. The discharge volume contains a gas mixture of HCl/Kr/Ne operated at a total pressure of up to 5 bar. For a plane-plane resonator, the divergence of both output laser beams is measured. A low beam divergence of less than 1 mrad is measured as a result of the very high discharge homogeneity. A maximum laser pulse duration of 150 ns (FWHM) is achieved for a pump duration of 270 ns (FWHM) and a power density of 340 kW cm −3 . Pumping the discharge under optimum conditions employing a stable resonator results in a maximum specific energy of 0.45 J/l with a laser pulse duration of 117 ns and an efficiency of 0.63% based on the deposited energy. High-pressure gas-discharge pumped rare-gas halide excimer lasers are sources of very powerful ultraviolet (UV) radiation. The wavelength range covered and the high pulse energies have made excimer lasers an extensively used tool for applications in science, industry and also in medicine [1,2]. Gas discharge pumping opened the way to UV-lasers with pulse repetition rates up to several kHz with output powers up to the kW-level. However, excimer lasers pumped by a simple charge-transfer circuit [3,4] are restricted to low efficiencies and short pulse durations of only a few tens of nanoseconds. Voltage matching between the storage capacitance used to pump the laser and the discharge steady-state voltage is hardly achievable with such circuits. The discharge current tends to oscillate under these conditions. Discharge instabilities grow rapidly due to the voltage mismatching and the current oscillation. The beam quality of these lasers is poor, as the required time to build up a beam with a low divergence is longer than the stability time of the discharge.An important step to increase the efficiency and pulse duration of excimer lasers has been the development of u Fax: +31 53 4891102, E-mail: l.c.casper@tnw.utwente.nl the prepulse-mainpulse excitation technique [5,6]. The prepulse, a very fast rising high-voltage pulse, is applied to the discharge electrodes within a few nanoseconds after preionization to initiate the discharge homogeneously. A lowimpedance circuit generates the mainpulse in order to sustain the discharge and to pump the laser. The mainpulse voltage can be chosen independently from the prepulse voltage. Therefore, matching between the sustaining voltage and the steady-state voltage can be realized. As a result, this excitation technique leads to an optimization of the pump efficiency as the voltage matching is possible and current ringing can be avoided. The discharge stability improves considerably and leads to an extension of the laser pulse duration. In the case of XeCl lasers (308 nm), laser pulse durations of several hundreds of nanoseconds with efficiencies up to 5% have been realized [7,8] and raised strong interest in science and indu...

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Section: 2supporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Long-pulse KrCl laser with a high discharge quality

et al. 2007

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“…It was reported in Ref. 8,10 about the successful implementation of this system both with equal and nonequal discharge gaps for excitation excimer, Ar.Xe and CO2 -laser mixtures.…”

Section: Introductionmentioning

confidence: 95%

XeCl laser based on a three-electrode system of a double discharge formation

Borovkov¹,

Воронин²,

Voronov³

et al. 1998

SPIE Proceedings

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The paper describes a three-electrode electric-discharge XeC1 -laser, in which the discharge ignition takes place, when a highvoltage pulse is delivered to a middle control electrode, a capacitor bank of the main discharge is connected directly to two other electrodes. The three-electrode system of a double discharge formation provides a sequential in time breakdown of two discharge gaps followed by a general discharge current The laser reached the high efficiency up to 3.7 % with the fast commutation < 5 % from the pump energy and a significant decrease of the load on the elements of the electric system of the laser power supply.

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“…The theoretical results are in a good agreement with experimental data. Moreover, typical working proportions of mixes lay approximately in such range for electro-discharge XeCl-lasers [5][6][7][8][9][10][11][12].…”

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confidence: 99%

<title>Stability of quasi-steady mode of electro-discharge XeCl lasers</title>

2008

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The influence of gas mixing ratio on stability of quasi-steady mode of electro-discharge XeCl-lasers operation is discussed. The simplified model for electric-discharge XeCl-laser is presented. Although there are many reports on the models of XeCl-laser, for an analysis having clear physical sense it is useful to have a simplified kinetic model. The model enables to calculate an electrons concentration, density of excimer XeCl * molecules and specific energy deposition in active medium. The quasi-steady mode of discharge in XeCl-lasers is analyzed.

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Highly efficient gas lasers with a three-electrode double discharge

Cited by 4 publications

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Long-pulse KrCl laser with a high discharge quality

Long-pulse KrCl laser with a high discharge quality

XeCl laser based on a three-electrode system of a double discharge formation

<title>Stability of quasi-steady mode of electro-discharge XeCl lasers</title>

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