Abstract
We report evidence of strong lasing on the 4p-4s transition at 62.7nm in nickel-like krypton occurring simultaneously with the usual 4d-4p lasing at 32.8nm. The gain dynamics of both transitions were experimentally and numerically investigated and found comparable. The two-color amplifier was seeded by the same harmonic pulse, therefore producing a short-duration coherent two-color soft x-ray laser pulse. Both transitions offer similar prospects of pulse energy and duration and could lead to the delivery of intense and ultrashort two-color coherent soft x-ray pulses with a controllable delay.
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