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We report the generation of laser pulse energies up to 30μJ at 46.9 nm in the plasma column of a fast compressional capillary discharge. Double pass experiments using an iridium mirror achieved a gain-length product greater than 25. The results provide the first clear evidence of saturated operation of a table-top soft x-ray amplifier.
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Rocca et al. (1996) studied this question.
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