Erlangen 2018 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Pulsed Power - Laser-Beam Matter Interaction
K 4.6: Talk
Wednesday, March 7, 2018, 15:30–15:45, MB HS
Mid-infrared supercontinuum generation in germanate and tellurite photonic crystal fibers — •Rafal Sopalla1, Heinar Hoogland2,3, Jiapeng Huang1, Fehim Babic1, Roland Holzwarth2, Xin Jiang1, and Philip St.J. Russell1 — 1Max-Planck-Institute for the Science of Light, 91058 Erlangen, Germany — 2Menlo Systems GmbH, 82152 Martinsried, Germany — 3Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
We report recent advances in the development of soft-glass photonic crystal fibers, with tailored dispersion for broadband supercontinuum extending into the mid-infrared. Two types of PCFs, made from germanate and tellurite glasses, are engineered for pumping at 2 μm. The tellurite PCF has a solid core with diameter 6.2 μm, surrounded by five-rows of hollow channels, with a relatively high air-filling-fraction of >80%. This highly nonlinear solid-core PCF has a zero dispersion wavelength of 1.8 μm, shifted from 2.2 μm in bulk material. The germanate PCF has a core ~1.9 μm in diameter held in place by three thin glass membranes and thus surrounded by three large hollow channels. Its zero dispersion wavelength is 1.5 μm. A 2.05 μm fiber laser CPA system (based on MenloSystems Red-Fiber) generating 400-fs pulses at 10 MHz and 1.2-W average power is used as pump., The generated supercontinuum spectrum in a 16 mm length of tellurite PCF starts from 0.54 μm and extends well beyond 3.5 μm. The results are verified by numerical simulations based on the commonly used generalized nonlinear Schrödinger equation for the slowly varying complex envelope of the pulses.