Increased mid-infrared supercontinuum bandwidth and average power by tapering large-mode-area chalcogenide photonic crystal fibers

Christian Rosenberg Petersen, Rasmus Dybbro Engelsholm, Christos Markos, Laurent Brilland, Celine Caillaud, Johann Troles, Ole Bang

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The trade-off between the spectral bandwidth and average output power from chalcogenide fiber-based mid-infrared supercontinuum sources is one of the major challenges towards practical application of the technology. In this paper we address this challenge through tapering of large-mode-area chalcogenide photonic crystal fibers. Compared to previously reported step-index fiber tapers the photonic crystal fiber structure ensures single-mode propagation, which improves the beam quality and reduces losses in the taper due to higher-order mode stripping. By pumping the tapered fibers at 4 mu m using a MHz optical parametric generation source, and choosing an appropriate length of the untapered fiber segments, the output could be tailored for either the broadest bandwidth from 1 to 11.5 mu m with 35.4 mW average output power, or the highest output power of 57.3 mW covering a spectrum from 1 to 8 mu m. (C) 2017 Optical Society of America
Original languageEnglish
JournalOptics Express
Issue number13
Pages (from-to)15336-15347
Publication statusPublished - 2017

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