[2] [2] Godina R, Rodrigues E, Matias J, et al. Energies, 2015, 8(10): 12147.

[6] [6] Jones D J, Diddams S A, Ranka J K, et al. Science, 2000, 288(5466): 635.

[8] [8] Mehravar S, Norwood R A, Peyghambarian N, et al. Applied Physics Letters, 2016, 108(23): 231104.

[9] [9] Okubo S, Hsieh Y, Inaba H, et al. Optics Express, 2015, 23(26): 33184.

[10] [10] Hébert N B, Michaud-Belleau V, Magnan-Saucier S, et al. Optics Letters, 2016, 41(10): 2282.

[11] [11] Zhang W, Chen X, Wu X, et al. Photonics Research, 2019, 7(8): 883.

[13] [13] Coddington I, Newbury N, Swann W. Optica, 2016, 3(4): 414.

[14] [14] Picqué N, Hnsch T W. Nature Photonics, 2019, 13(3): 146.

[15] [15] Galli I, Bartalini S, Borri S, et al. Physical Review Letters, 2011, 107(27): 270802.

[17] [17] Rieker G B, Giorgetta F R, Swann W C, et al. Optica, 2014, 1(5): 290.

[18] [18] Newbury N R, Coddington I, Swann W. Optics Express, 2010, 18(8): 7929.

[19] [19] Roy J, Deschenes J D, Potvin S, et al. Optics Express, 2012, 20(20): 21932.