Abstract
A pulsed He-Kr laser with a helical hollow cathode is investigated. A modified cathode is proposed. The modification involves making the cathode coil from a ribbon-shaped material. The design of the cathode chosen allows one to obtain appreciable lifetime of the laser tube and to reach repetition rates up to 1 kHz. Lasing on the KrII 469.4 nm and KrII 431.8 nm lines is obtained from 265 mm active length and gain coefficients of 25% m-1 and 14% m-1, respectively are measured at 8 A peak current. It is demonstrated that the ambipolar diffusion of Kr ions, as well as the specific helical shape of the cathode, are causes for the pulsed mode of laser operation.
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