Mid-Infrared Octave-Spanning Supercontinuum and Frequency Comb Generation in a Suspended Germanium-Membrane Ridge Waveguide

Jinhui Yuan, Zhe Kang, Feng Li, Xianting Zhang, Xinzhu Sang, Qiang Wu, Binbin Yan, Kuiru Wang, Xian Zhou, Kangping Zhong, Guiyao Zhou, Chongxiu Yu, Chao Lu, Hwa Yaw Tam, Ping Kong Alexander Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)

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 ultrabroadband MIR-SC generation using a suspended germanium-membrane ridge waveguide. We theoretically showed that when pump pulses centered at 4.8 μm 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 μm (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.
Original languageEnglish
Article number7926404
Pages (from-to)2994-3002
Number of pages9
JournalJournal of Lightwave Technology
Volume35
Issue number14
DOIs
Publication statusPublished - 15 Jul 2017

Keywords

  • Frequency comb generation
  • Ge waveguide
  • mid-infrared region
  • supercontinuum generation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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