Broadband frequency comb generation through cascaded quadratic nonlinearity in thin-film lithium niobate microresonators.
Opt Lett
; 49(9): 2449-2452, 2024 May 01.
Article
en En
| MEDLINE
| ID: mdl-38691741
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 150â
nm (80â
nm) and 25â
nm (12â
nm) for center wavelengths at 1560 and 780â
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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Opt Lett
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2024
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Article