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, Alex Wai

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

54 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
Pages (from-to)2994-3002
Number of pages9
JournalJournal of Lightwave Technology
Volume35
Issue number14
Early online date11 May 2017
DOIs
Publication statusPublished - Jul 2017

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics

User-Defined Keywords

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

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