Low-NA single-mode LMA photonic crystal fiber amplifier

Thomas Tanggaard Alkeskjold, Marko Laurila, Lara Scolari, Jes Broeng, Marko Laurila

Research output: Contribution to journalConference articleResearchpeer-review


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.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Pages (from-to)79141S
Publication statusPublished - 2011
EventFiber Lasers 8: Technology, Systems, and Applications - San Francisco, CA, United States
Duration: 24 Jan 201127 Jan 2011
Conference number: 8


ConferenceFiber Lasers 8
Country/TerritoryUnited States
CitySan Francisco, CA


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