15 February 2012 Er-doped single-frequency photonic crystal fiber amplifier with 70 W of output power for gravitational wave detection
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Abstract
We report on a single-frequency large mode area Er-doped photonic crystal fiber amplifier system. The active fiber had a core with 40 μm diameter and a numerical aperture of <0.04. This resulted in a mode field diameter of about 31 μm around 1550 nm wavelength. In a master-oscillator power-amplifier scheme, 70.8 W of output power at 1556 nm have been obtained. The maximum output power was limited by the amount of available pump power. Very high fractional TEM00 content - and thus near diffraction limited output beam quality - has been verified by measurements with a non-confocal scanning ring cavity.
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Vincent Kuhn, Vincent Kuhn, Dietmar Kracht, Dietmar Kracht, Jörg Neumann, Jörg Neumann, Peter Weßels, Peter Weßels, } "Er-doped single-frequency photonic crystal fiber amplifier with 70 W of output power for gravitational wave detection", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82371G (15 February 2012); doi: 10.1117/12.906353; https://doi.org/10.1117/12.906353
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