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Precise control of micro-rod resonator free spectral range via iterative laser annealing [Early Posting]

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摘要

We demonstrate a novel method to control the free spectral range (FSR) of silica micro-rod resonator precisely. This method is accomplished by iteratively applying laser annealing on the already-fabricated microrod resonators. Fine and repeatable increasing of resonator FSR is demonstrated and the best resolution is smaller than 5 MHz, while the resonator Q-factor is only slightly affected by the iterative annealing procedure. Using the fabricated micro-rod resonators, single dissipative Kerr soliton microcombs are generated, and soliton repetition frequencies are tuned precisely by iterative annealing process. The demonstrated method can be used for dual-comb spectroscopy and coherent optical communications.

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Wen Qin,Cui Wenwen,Geng Yong,Zhou Heng,Qiu Kun. Precise control of micro-rod resonator free spectral range via iterative laser annealing[J].Chinese Optics Letters,2021,19(7):07.