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X‐ray emissions in the spectral range of 2–13 nm from 21 kinds of material (carbon through tin) irradiated either by a 4 J/35 ns slab Nd:glass laser or by a 0.5 J/8 ns Nd:YAG laser were recorded with a grazing incidence spectrometer equipped with a microchannel plate detector. The absolute photon intensities of the spectra from these materials were determined. The variation of the molybdenum spectrum with laser irradiance was also investigated. Finally, the spectra ranging from 2 to 13 nm produced by the Nd:YAG laser of both the fundamental (1.06 μm) and its second‐harmonic (0.53 μm) wavelengths are compared.