期刊
OPTICA
卷 7, 期 4, 页码 309-315出版社
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.382992
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- Defense Threat Reduction Agency [HD-TRA11810047]
- Air Force Office of Scientific Research [FA9550-18-1-035]
- Resnick Sustainability Institute for Science, Energy and Sustainability, California Institute of Technology
- KavliNanoscience Institute
With their compact size and semiconductor-chip-based operation, frequency microcombs can be an invaluable light source for gas spectrcoscopy. However, the generation of mid-infrared (mid-IR) frequency combs with gigahertz line spacing as required to resolve many gas spectra represents a significant challenge for these devices. Here, a technique referred to as interleaved difference-frequency generation (iDFG) is introduced that densifies the spectral line spacing upon conversion of near-IR comb light into the mid-IR light. A soliton microcomb is used as both a comb light source and microwave oscillator in a demonstration, and the spectrum of methane is measured to illustrate how the resulting mid-IR comb avoids spectral undersampling. Beyond demonstration of the iDFG technique, this work represents an important feasibility step towards more compact and potentially chip-based mid-IR gas spectroscopy modules. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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