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Versatile silicon-waveguide supercontinuum for coherent mid-infrared spectroscopy

2018; AIP Publishing; Volume: 3; Issue: 3 Linguagem: Inglês

10.1063/1.5006914

2378-0967

Nima Nader, Daniel L. Maser, Flávio C. Cruz, Abijith S. Kowligy, Henry Timmers, Jeff Chiles, Connor Fredrick, Daron Westly, Sae Woo Nam, Richard P. Mirin, Jeffrey M. Shainline, Scott A. Diddams,

Photonic Crystal and Fiber Optics

Laser frequency combs, with their unique combination of precisely defined spectral lines and broad bandwidth, are a powerful tool for basic and applied spectroscopy. Here, we report offset-free, mid-infrared frequency combs and dual-comb spectroscopy through supercontinuum generation in silicon-on-sapphire waveguides. We leverage robust fabrication and geometrical dispersion engineering of nanophotonic waveguides for multi-band, coherent frequency combs spanning 70 THz in the mid-infrared (2.5 μm–6.2 μm). Precise waveguide fabrication provides significant spectral broadening with engineered spectra targeted at specific mid-infrared bands. We characterize the relative-intensity-noise of different bands and show that the measured levels do not pose any limitation for spectroscopy applications. Additionally, we use the fabricated photonic devices to demonstrate dual-comb spectroscopy of a carbonyl sulfide gas sample at 5 μm. This work forms the technological basis for applications such as point sensors for fundamental spectroscopy, atmospheric chemistry, trace and hazardous gas detection, and biological microscopy.