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The multimode and depolarized output beam of a multimode diode-pumped Yb-doped fiber amplifier is converted to a diffraction limited, linearly polarized beam by a self-referencing two wave mixing process in an infrared sensitive photorefractive crystal.
We demonstrate a diode-pumped Yb-doped fiber master oscillator (Nd:YAG) power multimode amplifier. The multimode output beam is converted to singlemode by a two wave mixing process in an infrared sensitive photorefractive crystal. Up to 1 W singlemode output is achieved by compensation of thermally-induced phase fluctuations in the fiber.
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