Prof. Abdelkader Medjouri Profile

Prof. Abdelkader Medjouri

at Univ Echahid Hamma Lakhdar d'El Oued

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SPIE Journal Paper | 15 September 2022

Numerical investigation of coherent supercontinuum generation via soliton implosion in ZBLAN photonic crystal fiber

Abdelkader Medjouri, Djamel Abed

OE, Vol. 61, Issue 09, 096106, (September 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.9.096106

KEYWORDS: Solitons, Dispersion, ZBLAN, Supercontinuum generation, Glasses, Raman spectroscopy, Wave propagation, Signal analyzers, Raman scattering, Optical engineering

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We numerically investigate coherent supercontinuum (SC) generation extending from the deep ultraviolet to the mid-infrared spectral region using few-cycle optical pulses, pumped into a ZBLAN photonic crystal fiber. The finite difference method is used to optimize the fiber structure and achieve two zero dispersion wavelengths, with a broad anomalous dispersion region. The propagation of ultrashort pulses and their nonlinear dynamics is accurately modeled by employing the forward unidirectional propagation equation for the analytic signal of the pulse electric field. We show that by pumping in the anomalous regime of dispersion, the high-order solitons undergo an implosion process and spectral broadening is achieved via the contribution of self-phase modulation, self-steepening, and shock formation, along with a strong transfer of energy into a nonsolitonic resonant Cherenkov-like radiation in the normal dispersion region. Furthermore, numerical results indicate that broadband supercontinua spanning the region from 0.22 to 4.6 μm is successfully achieved with a pulse having a soliton order and duration of 12 and 6 fs, respectively. In addition, the deterministic feature of the implosion mechanism exhibits very low sensitivity to the input quantum noise and achieves excellent coherence properties. The proposed multioctave SC source is found promising for various potential applications, such as two-photon excited autofluorescence, bioimaging, spectroscopy, optical signal processing, and medicine.

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