[2] [2] SPILLANE S M, KIPPENBERG T J, VAHALA K J. Ultralo wthreshold Raman laser using a spherical dielectric microcavity[J]. Nature, 2002, 415: 621-623.

[3] [3] DONG C H, HE L, XIAO Y F, et al. Fabrication of high-Q polydimethy-lsiloxane optical microspheres for thermal sensing[J]. Applied Physics Let-ters, 2009, 94(23): 231110-1-231110-3.

[4] [4] LU T, YANG L, LOON R V A V, et al. On-chip green silica upconver-sion microlaser[J]. Optics Letters, 2009, 34(4): 482-484.

[5] [5] MARIN-PALOMO P, KEMAL J N, KARPOV M, et al. Microresonator-based solitons for massively parallel coherent optical communications[J]. Nature, 2017, 546: 274-279.

[6] [6] VAHALA K J. Optical microcavities[J]. Nature, 2003, 424: 839-846.

[7] [7] MURUGAN G S, WILKINSON J S, ZERVAS M N. Selective excita-tion of whispering gallery modes in a novel bottle microresonator[J]. Optics Express, 2009, 17(14): 11916-11925.

[8] [8] PFEIFFER M H P, LIU J, GEISELMANN M, et al. Coupling ideality of integrated planar high-Q microresonators[J]. Physical Review Applied, 2016, 7(2): 024026-1-024026-8.

[10] [10] ZOU C L, YANG Y, DONG C H, et al. Taper-microsphere coupling with numerical calculation of coupled-mode theory[J]. Journal of the Optical Society of America B, 2008, 25(11): 1895-1898.

[11] [11] DEL'HAYE P, DIDDAMS S, PAPP S B. Laser-machined ultra-high-Q microrod resonators for nonlinear optics[J]. Applied Physics Letters, 2013, 102(22): 221119-1-221119-4.