[1] K. J. Vahala. Optical microcavities. Nature, 424, 839-846(2003).
[9] J. W. Strutt, B. Rayleigh. The problem of the whispering gallery. Phil. Mag., 20, 1001-1004(1910).
[135] J. L. Xiao, C. G. Ma, Z. X. Xiao, Y. D. Yang, Y. Z. Huang. Random bit generation in dual transverse mode microlaser without optical injection or feedback. IEEE International Semiconductor Laser Conference ISLC, 171-172(2018).