[1] Moerner W E. Persistent spectral hole burning: science and applications, Berlin: Springer-Verlag, 1988. 127～150

[2] Yano R, Mitsunaga M, Uesugi N. Nonlinear laser spectroscopy of Eu3+:Y2SiO5 and its application to time-domain optical memory. J. Opt. Soc. Am., 1992, 9(6):992～997

[3] Gschnedner K A, Jr., Eyring L. Handbook on the physics and chemistry of rare earths, New York, Oxford: North-Holland Publishing Company, 1979, 4:244～245

[4] Li C, Lagriffoul A, Moncorge R et al.. Luminescence properties of Tm3+ doped silicates Y2SiO5, CaY4(SiO4)3O and SrY4(SiO4)3O. J. Luminescence, 1994, 62(3/4):157～171

[5] Li C, Wyon C, Moncorge R. Spectroscopic properties and fluorescence dynamics of Er3+ and Yb3+ in Y2SiO5. IEEE J. Quant. Electron., 1992, QE-28(4):1209～1221