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
Abstract
AbstractWe 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 $$\upmu \hbox {m}$$
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 $$\mu$$
μ
m is broadened due to zero-dispersion wavelength shift along the taper.
Funder
Agence Nationale de la Recherche
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,Physics and Astronomy (miscellaneous),General Engineering