The formation of high-Q polygon modes in weakly perturbed microdisks on thin-film lithium niobate and its applications

Jintian Lin; Renhong Gao; Botao Fu; Ni Yao; Jianglin Guan; Chuntao Li; Minghui Li; Guanghui Zhao; Ya Cheng

doi:10.1117/12.2691722

26 November 2023 The formation of high-Q polygon modes in weakly perturbed microdisks on thin-film lithium niobate and its applications

Jintian Lin, Renhong Gao, Botao Fu, Ni Yao, Jianglin Guan, Chuntao Li, Minghui Li, Guanghui Zhao, Ya Cheng

Author Affiliations +

Proceedings Volume 12775, Quantum and Nonlinear Optics X; 1277507 (2023) https://doi.org/10.1117/12.2691722
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Mode trimming of suitable dispersion in a high-Q microresonator is of vital importance for lots of photonic applications ranging from Kerr soliton comb generation, single-frequency lasing to nonlinear frequency conversion. However, almost all the dispersion engineering and mode trimming cannot be tuned once the resonator structure is made. To overcome this difficulty, weak perturbation was introduced into a circular lithium niobate (LN) microdisk for the formation of polygon modes by a coupled tapered fiber. Various polygon modes with different spatial field distributions and star mode can be formed by tuning the pump wavelength and the coupling position. Thanks to the small spatial modal overlap between the polygon modes and the whispering gallery modes (WGMs), densely distributed WGM families were avoided to be excited under polygon-mode optical pump. Therefore, single-frequency/dual-wavelength microlasers have been demonstrated with narrow linewidths in weakly-perturbed erbium-doped LN microdisks, and Kerr soliton microcomb has been generated in the telecom band in a normal-dispersion LN microdisk by mode trimming through the excitation of the anomalous-dispersion polygon modes.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Jintian Lin, Renhong Gao, Botao Fu, Ni Yao, Jianglin Guan, Chuntao Li, Minghui Li, Guanghui Zhao, and Ya Cheng "The formation of high-Q polygon modes in weakly perturbed microdisks on thin-film lithium niobate and its applications", Proc. SPIE 12775, Quantum and Nonlinear Optics X, 1277507 (26 November 2023); https://doi.org/10.1117/12.2691722

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KEYWORDS

Whispering gallery modes

Solitons

Microresonators

Dispersion

Lithium niobate

Thin films

Raman scattering

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