Beyond 100 THz-spanning ultraviolet frequency combs in a non-centrosymmetric crystalline waveguide

Xianwen Liu, Alexander W. Bruch, Juanjuan Lu, Zheng Gong, Joshua B. Surya, Liang Zhang, Junxi Wang, Jianchang Yan and Hong X. Tang ()
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Xianwen Liu: Yale University
Alexander W. Bruch: Yale University
Juanjuan Lu: Yale University
Zheng Gong: Yale University
Joshua B. Surya: Yale University
Liang Zhang: Chinese Academy of Sciences
Junxi Wang: Chinese Academy of Sciences
Jianchang Yan: Chinese Academy of Sciences
Hong X. Tang: Yale University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Ultraviolet frequency combs enable applications ranging from precision spectroscopy to atomic clocks by addressing electronic transitions of atoms and molecules. Access to ultraviolet light via integrated nonlinear optics is usually hampered by the strong material dispersion and large waveguide attention in ultraviolet regions. Here we demonstrate a simple route to chip-scale ultraviolet comb generators, simultaneously showing a gap-free frequency span of 128 terahertz and high conversion efficiency. This process relies on adiabatic quadratic frequency translation of a near-visible supercontinuum sourced by an ultrafast fiber laser. The simultaneous cubic and quadratic nonlinear processes are implemented in single-crystalline aluminum nitride thin films, where chirp-modulated taper waveguides are patterned to ensure a broad phase matching. The heterodyne characterization suggests that both the near-visible and ultraviolet supercontinuum combs maintain high coherence. Our approach is also adaptable to other non-centrosymmetric photonic platforms for ultrafast nonlinear optics with scalable bandwidth.

Date: 2019
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DOI: 10.1038/s41467-019-11034-x

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