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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas Tanggaard Alkeskjold, Thomas Tanggaard Alkeskjold, Marko Laurila, Marko Laurila, Lara Scolari, Lara Scolari, Jes Broeng, 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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