Broadband frequency comb generation through cascaded quadratic nonlinearity in thin-film lithium niobate microresonators

Chao Tang; Chao Tang; Mingming Nie; Mingming Nie; Jia-yang Chen; Jia-yang Chen; Zhaohui Ma; Zhaohui Ma; Zhan Li; Zhan Li; Yijun Xie; Yong Meng Sua; Yong Meng Sua; Shu-Wei Huang; Shu-Wei Huang; Yu-Ping Huang; Yu-Ping Huang

doi:10.1364/OL.523920

Optics Letters
Vol. 49,
Issue 9,
pp. 2449-2452
(2024)
•https://doi.org/10.1364/OL.523920

Broadband frequency comb generation through cascaded quadratic nonlinearity in thin-film lithium niobate microresonators

Chao Tang, Mingming Nie, Jia-yang Chen, Zhaohui Ma, Zhan Li, Yijun Xie, Yong Meng Sua, Shu-Wei Huang, and Yu-Ping Huang

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Chao Tang, Mingming Nie, Jia-yang Chen, Zhaohui Ma, Zhan Li, Yijun Xie, Yong Meng Sua, Shu-Wei Huang, and Yu-Ping Huang, "Broadband frequency comb generation through cascaded quadratic nonlinearity in thin-film lithium niobate microresonators," Opt. Lett. 49, 2449-2452 (2024)

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Abstract

Broadband frequency comb generation through cascaded quadratic nonlinearity remains experimentally untapped in free-space cavities with bulk χ⁽²⁾ materials mainly due to the high threshold power and restricted ability of dispersion engineering. Thin-film lithium niobate (LN) is a good platform for nonlinear optics due to the tight mode confinement in a nano-dimensional waveguide, the ease of dispersion engineering, large quadratic nonlinearities, and flexible phase matching via periodic poling. Here we demonstrate broadband frequency comb generation through dispersion engineering in a thin-film LN microresonator. Bandwidths of 150 nm (80 nm) and 25 nm (12 nm) for center wavelengths at 1560 and 780 nm are achieved, respectively, in a cavity-enhanced second-harmonic generation (doubly resonant optical parametric oscillator). Our demonstration paves the way for pure quadratic soliton generation, which is a great complement to dissipative Kerr soliton frequency combs for extended interesting nonlinear applications.

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Supplementary Material (1)

Name	Description
Supplement 1	Numerical simulations for the cascaded quadratic processes.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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