Multipass amplifiers using optical circulators

A method of multipassing a pulse of light through an amplifier using an optical circulator, a nonreciprocal component composed of polarization beam splitters and a Faraday rotator, is presented. The pulse can be double, triple, or quadrupole passed through the amplifier depending upon the arrangement of the optical circulator. Numerical calculations and experimental results for multipass amplifiers are presented.<
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