Abstract

Soft-x-ray radiation was generated by focusing the beam of a Q-switched Nd:glass laser on a steel target in a chamber filled with He at pressures of 10⁻⁵ mbar ≦ p ≦ 500 mbar. The radiation at λ ≦ 1.5 nm was detected using a P–I–N diode behind a 25-μm Be foil. For He pressures p < 100 mbar and laser pulse energies ≦2 J, the soft-x-ray emission of the laser-produced plasma was reduced by less than 10% compared with the emission under high-vacuum conditions. The half-width τ_x-ray of the soft-x-ray emission time was independent of p and of the same order as the laser pulse half-width τ_LASER ≈ 17 nsec.

© 1984 Optical Society of America

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