Abstract

We investigate the focusability of intense coherent soft-x-ray radiation generated by high-order harmonic conversion. The 27th-harmonic wave at 29.6 nm is focused by an off-axis parabolic mirror with a $\mathrm{SiC}/\mathrm{Mg}$ multilayer coating. Focal-spot images are observed from the visible fluorescence induced by the soft-x-ray photons on a Ce:YAG scintillator. We demonstrate focusing of the soft-x-ray beam to a $1‐\mathit{\mu }\mathrm{m}$ spot size with a peak intensity of $1\times {10}^{14} \mathrm{W}/{\mathrm{cm}}^2$, which is to our knowledge the highest ever reported in the soft-x-ray region.

© 2004 Optical Society of America

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