Electrical Engineering and Computer Science Faculty Publications

Document Type

Article

Publication Title

Optical Materials Express

Abstract

This work reports on the fabrication and subsequent supercontinuum generation in a Ge-As-Se-Te/Ge-As-Se core/clad chalcogenide step-index fiber with an elliptical-core and an ultra-high numerical aperture of 1.88 ± 0.02 from 2.5 - 15 μm wavelength. The fiber has very low transmission loss of < 2 dB/m from 5-11 μm and a minimum loss of 0.72 ± 0.04 dB/m at 8.56 μm. Supercontinuum spanning from 2.1 μm to 11.5 μm with an average power of ~6.5mW was achieved by pumping a ~16 cm fiber with a minor/major axis core diameter of 4.2/5.2 μm with 250 fs pulses at 4.65 μm wavelength and a repetition rate of 20.88MHz. The effect of the elliptical-core was investigated by means of mechanical rotation of the fiber relative to the linear pump polarization, and it was found to cause a shift in the supercontinuum spectral edges by several hundred nanometers. © 2019 Optical Society of America.

First Page

2617

DOI

10.1364/OME.9.002617

Publication Date

2019

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