Visible-to-mid-IR tunable frequency comb in nanophotonics

Arkadev Roy, Luis Ledezma, Luis Costa, Robert Gray, Ryoto Sekine, Qiushi Guo, Mingchen Liu, Ryan M. Briggs and Alireza Marandi ()
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Arkadev Roy: California Institute of Technology
Luis Ledezma: California Institute of Technology
Luis Costa: California Institute of Technology
Robert Gray: California Institute of Technology
Ryoto Sekine: California Institute of Technology
Qiushi Guo: California Institute of Technology
Mingchen Liu: California Institute of Technology
Ryan M. Briggs: California Institute of Technology
Alireza Marandi: California Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Optical frequency comb is an enabling technology for a multitude of applications from metrology to ranging and communications. The tremendous progress in sources of optical frequency combs has mostly been centered around the near-infrared spectral region, while many applications demand sources in the visible and mid-infrared, which have so far been challenging to achieve, especially in nanophotonics. Here, we report widely tunable frequency comb generation using optical parametric oscillators in lithium niobate nanophotonics. We demonstrate sub-picosecond frequency combs tunable beyond an octave extending from 1.5 up to 3.3 μm with femtojoule-level thresholds on a single chip. We utilize the up-conversion of the infrared combs to generate visible frequency combs reaching 620 nm on the same chip. The ultra-broadband tunability and visible-to-mid-infrared spectral coverage of our source highlight a practical and universal path for the realization of efficient frequency comb sources in nanophotonics, overcoming their spectral sparsity.

Date: 2023
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DOI: 10.1038/s41467-023-42289-0

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