Photonics Research, 2017, 5 (6): 06000B54, Published Online: Dec. 7, 2017
Kerr frequency combs in large-size, ultra-high-Q toroid microcavities with low repetition rates [Invited] 
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Fig. 1. SEM images of toroid cavities: (a) cavity with principle diameter of 514 μm, (b) cavity with principle diameter of 800 μm, and (c) cavity with principle diameter of 1.88 mm.
Fig. 2. (a) Transmission spectrum of toroid cavity with a diameter of 514 μm and the corresponding intrinsic Q 2.7 × 10 8 Q 3.0 × 10 8 Q 3.3 × 10 8
Fig. 3. (a) Calculated dispersions represented as Δ FSR D
Fig. 4. (a) Measured threshold power of toroid with diameter of 514 μm, loaded Q 8.5 × 10 7 Q 2.4 × 10 8 Q 1.7 × 10 8
Fig. 5. First comb lines excited for (a) 514 μm toroid, first comb line excited 10 FSR away from the central mode; (b) 800 μm toroid, first comb line excited 10 FSR away from the central mode; and (c) 1.88 mm toroid, first comb line excited 18 FSR away from the central mode.
Fig. 6. Spectra of optical combs: (a-1) optical frequency comb in toroid with diameter of 514 μm, and corresponding repetition rate of 126 GHz; (a-2) closeup of nine comb lines around the pump mode; (b-1) optical frequency comb in toroid with diameter of 800 μm, and corresponding repetition rate of 82 GHz; (b-2) closeup of nine comb lines around the pump mode; (c-1) optical frequency comb in toroid with diameter of 1.88 mm, and corresponding repetition rate of 36 GHz; (c-2) closeup of nine comb lines around the pump mode.
Jiyang Ma, Xiaoshun Jiang, Min Xiao. Kerr frequency combs in large-size, ultra-high-Q toroid microcavities with low repetition rates [Invited][J]. Photonics Research, 2017, 5(6): 06000B54.
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