UV lasing was obtained with helical copper hollow cathodes. The output powers have been measured multiline (248–270 nm) for some helix geometries as a function of different discharge currents, Ne pressures, and mirror reflectivities. A maximum laser power of 580 mW has been obtained in a segmented discharge tube with a total active length of 1.2 m. Laser action was also observed at 780 nm with a power of 1.3 W. The discharge stability is superior to other arrangements.
Lasing in KrF was obtained with a longitudinal, self-sustained, high-voltage discharge. The output powers and energies at 248 nm have been measured for some tube geometries as a function of different He, Kr, and F2 partial pressures and mirror reflectivities. A maximum laser energy of 50 μJ has been obtained by discharging a capacitor of 360 pF and 60 kV across a segmented discharge tube with a total length of 70 cm and 6.5 mm inner diameter.
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