21 August 2015 Two octaves spanning supercontinuum in highly nonlinear As2Se3 nanophotonic crystal fiber for midinfrared applications
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Abstract
A new design of all-normal and near-zero flattened dispersion based on chalcogenide nanophotonic crystal fiber (PCF) has been proposed to generate smooth and ultra-broadband supercontinuum (SC) in the midinfrared (IR) region. With the optimized geometric parameters, the As2Se3 nano-PCF has been found to be suitable for two-octave supercontinuum generation (SCG). We designed a nano-PCF having a flat top dispersion curve with a maximum value of −2.3 [ps/(nm km)] and a large nonlinear coefficient equal to 7250 (W km)1 around the wavelength of 5.24  μm. By numerical simulations, we predict the generation of a very broadband SC in the mid-IR region extending from 2 to 10  μm in only 2-mm fiber lengths by using a femtosecond laser having a full-width at half-maximum of 50 fs and a relatively low energy of E=80  pJ. The generated SC demonstrates perfect coherence property over the entire bandwidth. SC generation extended into the mid-IR spectral region has potential usefulness in a variety of applications requiring a broad and mid-IR spectrum, such as WDM sources, fiber sensing, IR spectroscopy, fiber laser, and optical tomography coherence.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Amira Baili, Amira Baili, Rim Cherif, Rim Cherif, Mourad Zghal, Mourad Zghal, } "Two octaves spanning supercontinuum in highly nonlinear As2Se3 nanophotonic crystal fiber for midinfrared applications," Journal of Nanophotonics 9(1), 093059 (21 August 2015). https://doi.org/10.1117/1.JNP.9.093059 . Submission:
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