Mid-IR supercontinuum generation in birefringent, low loss, ultra-high numerical aperture Ge-As-Se-Te chalcogenide step-index fiber

Jayasuriya, D.; Petersen, C. R.; Furniss, D.; Markos, C.; Tang, Z.; Habib, MD. S.; Bang, O.; Benson, T. M; Seddon, A. B

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 ∼6.5 mW 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 20.88 MHz. 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.

• Journal Article Type: Article
• Acceptance Date: May 16, 2019
• Online Publication Date: May 16, 2019
• Publication Date: Jun 1, 2019
• Deposit Date: May 17, 2019
• Publicly Available Date: May 17, 2019
• Journal: Optical Materials Express
• Electronic ISSN: 2159-3930
• Publisher: Optical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 6
• Pages: 2617-2629
• DOI: https://doi.org/10.1364/ome.9.002617
• Keywords: Electronic, Optical and Magnetic Materials
• Public URL: https://nottingham-repository.worktribe.com/output/2062607
• Publisher URL: https://www.osapublishing.org/ome/abstract.cfm?uri=ome-9-6-2617
• Additional Information: This article is maintained by: OSA - The Optical Society; Crossref DOI link to publisher maintained version: https://doi.org/10.1364/OME.9.002617; Article type: research-article; Similarity check: Screened by Similarity Check; Peer reviewed: Yes; Review process: Single blind; Received: 8 April 2019; Accepted: 8 May 2019; Published: 16 May 2019; Copyright: © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement