Mid-infrared supercontinuum generation to 12.5μm in large NA chalcogenide step-index fibres pumped at 4.5μm
| Autor: | Bruce Napier, Zhuoqi Tang, Mark Farries, David Furniss, Ole Bang, Irnis Kubat, Slawomir Sujecki, Trevor M. Benson, Peter Fuhrberg, Karsten Scholle, Jon Ward, Uffe Møller, Samir Lamrini, Christian Agger, Angela B. Seddon, Peter M. Moselund |
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| Rok vydání: | 2014 |
| Předmět: |
GLASS-FIBERS
Materials science Chalcogenide PHOTONIC CRYSTAL FIBERS MULTIMODE OPTICAL-FIBERS 2 MU-M law.invention chemistry.chemical_compound RAMAN GAIN Optics law Fiber laser Dispersion (optics) INFRARED SUPERCONTINUUM Optical amplifier BROAD-BAND business.industry Laser Atomic and Molecular Physics and Optics FLUORIDE FIBERS Supercontinuum TIME-AVERAGED POWER Core (optical fiber) chemistry OPTICS REFRACTIVE-INDEX business Photonic-crystal fiber |
| Zdroj: | Kubat, I, Agger, C, Møller, U V, Seddon, A B, Tang, Z, Sujecki, S, Benson, T M, Furniss, D, Lamrini, S, Scholle, K, Fuhrberg, P, Napier, B, Farries, M, Ward, J, Moselund, P M & Bang, O 2014, ' Mid-infrared supercontinuum generation to 12.5μm in large NA chalcogenide step-index fibres pumped at 4.5μm ', Optics Express, vol. 22, no. 16, pp. 19169-19182 . https://doi.org/10.1364/OE.22.019169 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/OE.22.019169 |
| Popis: | We present numerical modeling of mid-infrared (MIR) supercontinuum generation (SCG) in dispersion-optimized chalcogenide (CHALC) step-index fibres (SIFs) with exceptionally high numerical aperture (NA) around one, pumped with mode-locked praseodymium-doped (Pr3+) chalcogenide fibre lasers. The 4.5um laser is assumed to have a repetition rate of 4MHz with 50ps long pulses having a peak power of 4.7kW. A thorough fibre design optimisation was conducted using measured material dispersion (As-Se/Ge-As-Se) and measured fibre loss obtained in fabricated fibre of the same materials. The loss was below 2.5dB/m in the 3.3-9.4μ m region. Fibres with 8 and 10μm core diameters generated an SC out to 12.5 and 10.7μm in less than 2m of fibre when pumped with 0.75 and 1kW, respectively. Larger core fibres with 20μm core diameters for potential higher power handling generated an SC out to 10.6μm for the highest NA considered but required pumping at 4.7kW as well as up to 3m of fibre to compensate for the lower nonlinearities. The amount of power converted into the 8-10 μm band was 7.5 and 8.8mW for the 8 and 10μm fibres, respectively. For the 20μm core fibres up to 46mW was converted. |
| Databáze: | OpenAIRE |
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