Refractive index dispersion of chalcogenide glasses for ultra-high numerical-aperture fiber for mid-infrared supercontinuum generation

Harshana G. Dantanarayana, Nabil Abdel-Moneim, Zhuoqi Tang, Lukasz Sojka, Slawomir Sujecki, David Furniss, Angela B. Seddon, Irnis Kubat, Ole Bang, Trevor M. Benson

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    Abstract

    We select a chalcogenide core glass, AsSe, and cladding glass, GeAsSe, for their disparate refractive indices yet sufficient thermal-compatibility for fabricating step index fiber (SIF) for mid-infrared supercontinuum generation (MIR-SCG). The refractive index dispersion of both bulk glasses is measured over the 0.4 μm–33 μm wavelength-range, probing the electronic and vibrational behavior of these glasses. We verify that a two-term Sellmeier model is unique and sufficient to describe the refractive index dispersion over the wavelength range for which the experimentally determined extinction coefficient is insignificant. A SIF composed of the glasses is fabricated and calculated to exhibit an ultra-high numerical aperture >0.97 over the entire wavelength range 0.4-33 μm suggesting that the SIF glass pair is a promising candidate for MIR-SCG. Material dispersion characteristics and the zero dispersion wavelength, both
    critical design parameters for SIF for MIR-SCG, are derived
    Original languageEnglish
    JournalOptics Express
    Volume4
    Issue number7
    Pages (from-to)1444
    Number of pages12
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2014

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