Journal
ACS PHOTONICS
Volume 5, Issue 7, Pages 2780-2785Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00579
Keywords
integrated photonics; silicon photonics; microresonators; parametric frequency conversion; infrared spectroscopy; optical frequency comb
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Funding
- Defense Advanced Research Projects Agency (DARPA) [W31P4Q15-1-0015]
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0303]
- National Science Foundation (NSF) [ECS-0335765]
- NSF
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We present a novel approach to realize microresonator-comb-based high resolution spectroscopy that combines a fiber-laser cavity with a microresonator. Although the spectral resolution of a chip-based comb source is typically limited by the free spectral range (FSR) of the microresonator, we overcome this limit by tuning the 200 GHz repetition-rate comb over one FSR via control of an integrated heater. Our dual-cavity scheme allows for self-starting comb generation without the need for conventional pump-cavity detuning while achieving a spectral resolution equal to the comb line width. We measure broadband molecular absorption spectra of acetylene by interleaving 800 spectra taken at 250 MHz per spectral step using a 60 GHz coarse-resolution spectrometer and exploit advances of an integrated heater, which can locally and rapidly change the refractive index of a microresonator with low electrical consumption (0.9 GHz/mW), which is orders of magnitude lower than a fiber-based comb. This approach offers a path toward a simple, robust, and low-power consumption CMOS-compatible platform capable of remote sensing.
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