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, Rim Cherif, 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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