Long-pulse KrCl laser with a high discharge quality |
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Authors: | LC Casper HMJ Bastiaens PJM Peters K-J Boller RM Hofstra |
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Institution: | (1) Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;(2) Nederlands Centrum voor Laser Research (NCLR) B.V., P.O. Box 2662, 7500 CR Enschede, The Netherlands |
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Abstract: | 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.
PACS 42.55.Lt; 52.25.-b; 52.59.Ye |
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Keywords: | |
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