[1] [1] T. J. Kane, R. L. Byre. Monolithic unidirectional single mode Nd:YAG laser. Opt. Lett., 1985, 10(1): 65～67

[2] [2] W. R. Trutna, D. K. Donald, M. Nazarathy. Unidirectional diode-laser-pumped Nd:YAG ring laser with a small magnetic field. Opt. Lett., 1987, 12(4): 248～250

[3] [3] R. Roy, P. A. Schulz, A. Walther. Acousto-optic modulator as an electronically selectable unidirectional device in a ring laser. Opt. Lett., 1987, 12(9): 672～674

[4] [4] J. Neev, F. V. Kowalski. Unidirectional device for a ring laser using an a cousto-optic modulator. Opt. Lett., 1988, 13(5): 375～377

[5] [5] W. A. Clarkson, A. B. Neilson, D. C. Hanna. Unidirectional operation of ring laser via acousto-optic modulator. IEEE. J. Quant. Electron., 1996, QE-32(2): 311～325

[6] [6] A. Yarif, P. Yeh. Optical Waves in Crystals. New York: Willy, 1992, ch. 9, 318～347