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The Ni-like 4d-4p laser scheme has been extended to wavelengths near the K absorption edge of carbon. A gain of 2. 3 cm^-1 with a duration of 250 psec was observed in Ni-like Ta at 44. 83 (a wavelength close to optimal for holographic imaging of live cells). Ni-like W produced a gain of 2. 6 cm^-1 with a total of seven gainlengths of amplification at 43. 18. This is the first demonstration of an x-ray amplifier on the short-wavelength side of the carbon K edge, within the ``water window. '' Both lasers should be scalable to coherent power sufficient for holographic imaging and other applications.
MacGowan et al. (Mon,) studied this question.
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