Abstract
We present what we believe is the first laser with its upper level embedded in the continuum of the valence electron. The laser employs a grating assisted traveling-wave geometry which creates a ~20ps long pulse of laser-produced soft x-rays traveling synchronously with the generated 96.9nm radiation. We measure a small-signal gain of 4.9cm−1 uniformly over a length of 17cm, or a total extrapolated small-signal gain of about exp(83). After about 4cm of length, the output energy grows linearly with length, indicating the laser transition is fully saturated.
© 1988 Optical Society of America
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