Mid-infrared octave-spanning supercontinuum and frequency comb generation in a suspended germanium-membrane ridge waveguide

Yuan, Jinhui, Kang, Zhe, Li, Feng, Zhang, Xianting, Sang, Xinzhu, Wu, Qiang, Yan, Binbin, Wang, Kuiru, Zhou, Xian, Zhong, Kangping, Zhou, Guiyao, Yu, Chongxiu, Lu, Chao, Tam, Hwa Yaw and Wai, Ping-kong Alexander (2017) Mid-infrared octave-spanning supercontinuum and frequency comb generation in a suspended germanium-membrane ridge waveguide. Journal of Lightwave Technology. ISSN 0733-8724 (In Press)

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Abstract

Stable octave-spanning supercontinuum (SC) in the mid-infrared (MIR) region finds extensive applications in spectroscopy, metrology, biochemistry, etc. The absorption of conventional silicon- or silicon oxide-dominated nonlinear media makes SC generation in MIR region technically challenging. In this paper, we propose ultra-broadband MIR-SC generation using a suspended germanium-membrane ridge waveguide. We theoretically showed that when pump pulses centered at 4.8 um with pulse width at 180 fs and peak power at 800 W are injected into a 4-mm long proposed ridge waveguide, the SC generated ranges from 1.96 ~ 12 um (about 2.6 octaves), extending deep into the “fingerprint” region. The first-order coherence is calculated to confirm the stability of the generated SC. The performance of the SC-based frequency comb is also investigated by assuming a 100-pulses pump source at a repetition rate of 100 KHz.

Item Type: Article
Uncontrolled Keywords: Supercontinuum generation, frequency comb generation, Ge waveguide, mid-infrared region
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 10 May 2017 07:56
Last Modified: 28 Jun 2017 16:00
URI: http://nrl.northumbria.ac.uk/id/eprint/30729

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