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

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 thi...

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Bibliographic Details
Published in:Journal of lightwave technology 2017-07, Vol.35 (14), p.2994-3002
Main Authors: 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, Wai, P. K. A.
Format: Article
Language:English
Subjects:
Absorption
Biochemistry
Dispersion
Fingerprint recognition
Frequency comb generation
Ge waveguide
Infrared spectroscopy
Metrology
mid-infrared region
Nonlinear optics
Nonlinearity
Octaves
Optical waveguides
Photonics
Pulse duration
Repetition
Silicon
supercontinuum generation
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Summary: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.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2017.2703644