Dispersion-Engineered T-type Germanium Waveguide for Mid-Infrared Supercontinuum and Frequency Comb Generations in All-Normal Dispersion Region

Lai, Jintao, Yuan, Jinhui, Cheng, Yujun, Mei, Chao, Zhou, Xian, Wu, Qiang, Yan, Binbin, Wang, Kuiru, Long, Keping, Yu, Chongxiu and Sang, Xinzhu (2020) Dispersion-Engineered T-type Germanium Waveguide for Mid-Infrared Supercontinuum and Frequency Comb Generations in All-Normal Dispersion Region. OSA Continuum, 3 (9). pp. 2320-2331. ISSN 2578-7519

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Official URL: https://doi.org/10.1364/osac.399941

Abstract

In this paper, a T-type Germanium (Ge) waveguide with the all-normal dispersion profile is designed for mid-infrared supercontinuum (SC) and frequency comb generations. The nonlinearity coefficient of the designed waveguide is calculated as 30.48 W-1·m-1 at the initial pump wavelength of 3.0 μm. Moreover, the group-velocity dispersion is kept low and flat in the considered wavelength range. Simulation results show that with the designed waveguide, the highly coherent and octave-spanning MIR SC can be generated in the wavelength range from 1.85 to 9.98 µm (more than 2.4 octaves) when the pump pulse with wavelength of 3.0 μm, peak power of 900 W, and duration of 120 fs is launched into the 5 mm long waveguide. When the pulse train including 50 pulses at a repetition rate of 100 MHz is used as the pump source, the SC-based frequency comb is obtained.

Item Type: Article
Additional Information: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 12 Aug 2020 15:04
Last Modified: 22 Sep 2020 12:30
URI: http://nrl.northumbria.ac.uk/id/eprint/44071

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