Improved x-ray switched XeCl laser

Goor, F.A. van; Trentelman, M.; Timmermans, John C.M.; Witteman, W.J.

doi:10.1063/1.355797

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…A number of electrical circuits and modes of operation has been studied during the course of the project [13,14,15]. Application of x-ray switching [16], where the pre pulse circuit and the main switch can be omitted simplifies the circuit significantly.…”

Section: X-ray Pre-ionisation Sourcementioning

confidence: 99%

<title>High-average power XeCl laser with x-ray preionization and spiker-sustainer excitation</title>

Goor

Witteman

Timmermans³

et al. 1994

SPIE Proceedings

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Section: X-ray Pre-ionisation Sourcementioning

confidence: 99%

<title>High-average power XeCl laser with x-ray preionization and spiker-sustainer excitation</title>

Goor

Witteman

Timmermans³

et al. 1994

SPIE Proceedings

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“…Output coupler reflectivity R OC = 0.9. Gas composition: HCl/Kr/Ne mixture of (1/90/3210) mbar These results are compared with the measured beam divergence of a long-pulse XeCl laser [17,18] with comparable discharge and resonator dimensions, because that laser has shown an excellent discharge quality. A beam divergence of 3 mrad has been reported for that XeCl laser when equipped with a plane-plane resonator, generating laser beams with a comparable beam cross section [16,17].…”

Section: Discharge Qualitymentioning

confidence: 99%

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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Magnetic-spiker excitation of gas-discharge lasers

Taylor

Leopold

1994

Appl. Phys. B

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Improved x-ray switched XeCl laser

Cited by 9 publications

References 12 publications

<title>High-average power XeCl laser with x-ray preionization and spiker-sustainer excitation</title>

<title>High-average power XeCl laser with x-ray preionization and spiker-sustainer excitation</title>

Long-pulse KrCl laser with a high discharge quality

Magnetic-spiker excitation of gas-discharge lasers

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