[1] [1] D. C. Nguyen, G. E. Faulker, M. Dulick. Blue-green (450 nm) upconvcrsion Tm3+:YLF laser. Appl. Opt., 1989, 28: 3553～3555

[2] [2] F. Duclos, P. Unquhart. Thulium-doped ZBLAN blue upconvcrsion fibre laser: theory. J. Opt. Soc. Am. B, 1995, 12: 709～717

[3] [3] M. Nakazawa, Y. Kimura, K. Suzuki. Efficient Er3+ optical fiber amplifier pumped by 1.48 μm InGaAsP laser diode. Appl. Phys. Lett., 1989, 54: 295～297

[4] [4] J. F. Michel. Rare earth ions doped fibers laser and amplifiers. Marcel Dekker, Inc., New York (1993)

[5] [5] E. A. Downing, L. Hesselink, R. M. Macfartane et al.. Solid-state three-dimensional computer display. Conference Proceedings-Laser and Elcctro-Optics Society Annual Meeting, Vol. 8, 1994, Publ by IEEE, IEEE Service Center, Piscataway, NJ, USA, p6～7

[6] [6] E. A. Downing, L. Hesselink, R. M. Macfarlane et al.. A laser-diode-driven, three-color, solid-state 3-D display. Technical Digest Series of Conference Lasers and Electro-Optics Society, Vol. 9, 1996, Publ by Optical Society of America, Washington, DC, USA, 1996, p89～92

[7] [7] L. J. Meng, C. Z. Zhong. The cross relation in elcctriolumincscence of ZnS:Er3+ thin film. J. Lumin., 1987, 39: 11～16

[8] [8] E. W. J. L. Oomen, P. M. T. Legall, A. M. A. van Dongen. On the origin of the red-band from erbium doped fluoride glasses excited with 800 nm. J. Lumin., 1990, 46: 353～358

[9] [9] R. E. Auzel. Materials and devices using double-pumped phosphors with energy transfer. Proceedings of the IEEE, 1973, 61(6):758～787

[10] [10] M. A. Chamarro, R. Cases. Infrared to visible upconversion of Er3+ ions in Yb3+ doped fluorohafnate glasses. J. Lumin., 1990, 46: 59～65