Abstract
A narrow-band adaptive multipass amplifier with four-wave phase-conjugating mirrors was developed. Pumping of these mirrors with radiations from two independent master oscillators was used in a three-pass CO2 amplifier with two four-wave mirrors operating on the basis of a thermal nonlinearity of a liquid (CCl4). The total gain achieved in this way was 2×1011. Two-pass and four-pass operation was also achieved and the corresponding gains were 1.5×107 and 5×109, respectively.
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