We report efficient production of Ni-like soft-x-ray-laser media1 with a curved-slab target2,3 and multiple laser pulses,4 as shown in Fig. 1. With this technique we have obtained lanthanide soft-x-ray lasers with a spectral range between 6 and 8 nm.4 The bend angle of 10 mrad for a 2.5-cm-long target, corresponding to a 2.5-m radius of curvature, provided the most intense lasing for the Ni-like Nd soft-x-ray laser. A laser beam of 1.053-μm wavelength was focused to a line of 2.8-cm length and approximately 80-μm average width. The laser pulse was composed of two pulses with the individual pulse widths of 100 ps, separated by 400 ps.

© 1995 Optical Society of America

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