[1] H. D. Hattendorff et al.; J. Phys. C: Solid State Phys., 1977, 11, 2399.

[2] S. E. Chinn, Η. Y-P Hong; Opt. Commun., 1975, 15, No. 3, 345.

[3] G. Euber, H. G. Danielmeyer; App1. Phys., 1979, 18, No. 1,77.

[4] Gerhard Winzer et al.;IEEE J. Quant. Bleclr., 1978, QE-14, No. 11, 840.

[5] V. L.BUak et al., Sοv. Phys. Dokl., 1978, 23, No. 5,199.

[6] S. B. Chinn et al.; Laser Focus, 1976, 12, No. 5, 64.

[7] Walter Koechner; "Solid State Laser Enginee ring", Springer-Varlag, 1976, p. 74～122.

[10] Luo Zundu et al.; Chinese Physics Letters, 1986, 3, No. 11~12.