Low-NA single-mode LMA photonic crystal rod fiber amplifier

Autor:	Jes Broeng, Thomas Tanggaard Alkeskjold, Lara Scolari, Marko Laurila
Rok vydání:	2011
Předmět:	Materials science business.industry Single-mode optical fiber Laser law.invention Optics law Fiber laser Fiber Laser beam quality business Absorption (electromagnetic radiation) Photonic crystal Photonic-crystal fiber
Zdroj:	SPIE Proceedings.
ISSN:	0277-786X
DOI:	10.1117/12.874545
Popis:	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.
Databáze:	OpenAIRE
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