Rodney Hodgson of IBM Research has built the shortest‐wavelength laser ever made, making hydrogen lase in the vacuum ultraviolet on eighteen lines between 1520 and 1615 Å, corresponding to photon energies of about 8 eV. Previously the shortest wavelength was 2120 Å, obtained by frequency multiplication of 10 600‐Å light from a neodymium‐doped glass laser. The new vacuum uv laser is expected to be useful in the study of chemical reactions and the interaction of high‐energy photons with matter.

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