SOME APPROACHES TO VACUUM UV AND XRAY LASERS
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The ejection of electrons from inner shells of atoms through photoionization is suggested as a straightforward means of creating population inversions at vacuum uv and x-ray wavelengths. This can be accomplished by photon sources covering broad bands. Sodium vapor and solid copper are examined as possible candidates for laser action at 372 and 1.54 , respectively. A first-rise traveling wave pump must be used; pumping powers required for superradiant operation run into several gigawatts, with rise times ranging from 10-9sec in the near-vacuum uv to 10-15sec in the x-ray region. 1967 The American Institute of Physics.