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Vacuum-uv radiation of laser-produced plasmas

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Abstract

The continuum radiation of laser-produced plasmas, from high-Z-material solid targets, has been studied experimentally in the range of 1000 to 2000 Å, with special attention to 1216 Å. The energy radiated per pulse was found to grow almost linearly with target irradiance, but more slowly with laser pulse length and wavelength. An ambient pressure of 10−1 torr is enough to reduce it considerably but it is weakly sensitive to focusing, target material, and laser incidence and observation angles. The absolute value of the radiance was measured in a number of cases. The highest spectral radiance obtained was 3.5 × 1022 photons s−1 cm−2 sr−1 Å−1 at 1200 Å, with a total of 3 × 1013 photons sr−1 Å−1 per pulse, for a laser energy of 10 J. Possible ways of improving this figure are discussed. A light-condensing system is described which increases the uv irradiance at the point of utilization and makes an operational and competitive source.

© 1973 Optical Society of America

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