학술논문
Fabrication and characterization of tapered photonic crystal fiber for broadband 2 µm: four-wave mixing-based fibered OPCPA.
Document Type
Article
Author
Ahmedou, Sidi-Ely; Walter, Guillaume; Herbuvaux, Jules; Dauliat, Romain; Février, Sébastien; Petit, Stéphane; Valentin, Constance; Marion, Denis; Lhermite, Jérôme; Labonté, Laurent; Tanzilli, Sébastien; Gérôme, Frédéric; Debord, Benoit; Benabid, Fetah; Leconte, Baptiste; Millot, Guy; Roy, Phillipe; Jamier, Raphaël; Delagnes, Jean-Christophe
Source
Subject
*PHOTONIC crystal fibers
*ACTIVE medium
*FOUR-wave mixing
*OPTICAL fibers
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Language
ISSN
0946-2171
Abstract
We present the simulation, fabrication, and characterization of large area microstructured fiber tapers which enables broadband phasematching conditions of the four wave-mixing process. These silica-based tapers are intended to serve as a nonlinear gain medium for intense and high average power Fiber Optical Parametric Chirped Pulse Amplifier emitting at 2 μ m and strongly pumped at Yb wavelength. Different geometries (tapered/untapered, aspect ratio, etc.) are fabricated, analyzed and their broadening properties—key for supporting ultrashort pulses amplification—are compared and discussed. The characterization of nonlinear gain bandwidth of the tapers relies on a tunable source of stochastic pulses based on tunable amplified spontaneous emission in Yb-doped amplifiers. The strong overshoots of this source allows degenerate four-wave mixing process to occur thus generating broadband incoherent visible signal and mid-infrared idler waves at much lower average power than usually needed with coherent pumping. The idler centered around 1.85 μ m is broadened due to zero-dispersion wavelength shift along the taper. [ABSTRACT FROM AUTHOR]