10 February 2011 Low-NA single-mode LMA photonic crystal rod fiber amplifier
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Enabling Single-Mode (SM) operation in Large-Mode-Area (LMA) fiber amplifiers and lasers is critical, since a SM output ensures high beam quality and excellent pointing stability. In this paper, we demonstrate and test a new design approach for achieving ultra-low NA SM rod fibers by using a spatially Distributed Mode Filter (DMF). This approach achieves SM performance in a short and straight rod fiber and allows preform tolerances to be compensated during draw. A low-NA SM rod fiber amplifier having a mode field diameter of ~60μm at 1064nm and a pump absorption of 27dB/m at 976nm is demonstrated.
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Thomas Tanggaard Alkeskjold, Marko Laurila, Lara Scolari, Jes Broeng, "Low-NA single-mode LMA photonic crystal rod fiber amplifier", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141S (10 February 2011); doi: 10.1117/12.874545; https://doi.org/10.1117/12.874545

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