[1] [1] Chivian J S, Case W E, Eden D D. The photon avalanche: A new phenomenon in Pr3+-based infrared quantum counters. Appl. Phys. Lett.,1979,35(2):124～125

[2] [2] Koch M E, Kueny A W, Case W E. Photon avalanche upconversion laser at 644 nm. Appl. Phys. Lett., 1990,56(12):1083～1085

[3] [3] Lenth W, Macfarlane R M. Excitation mechanisms for upconversion lasers. J. Lumin., 1990,45(1～6):346～350

[4] [4] Joubert M F, Guy S, Jacquier B. Model of the photon avalanche effect. Phys. Rev.(B),1993,48(14):10031～10037

[5] [5] Auzel F, Chen Y. Photon avalanche luminescence of Er3+ ions in LiYF4crystal. J. Lumin.,1995,65(1):45～56

[6] [6] Scheps R. Photon avalanche upconversion in Er3+YAlO3. IEEEJ. Quant. Electron.,1995,QE-31(2):309～316

[7] [7] Brenier A, Jurdyc A M. Looping mechanism and sequential two-photon absorption up-conversion: A comparison in YAlO3Er3+. J. Lumin.,1996,69(3):131～140

[8] [8] Macfarlane R M, Wannmacher R, Herbert T et al.. Upconversion laser action at 450.2 nm and 483.0 nm in TmLiYF4. CLEO-90Conf., Washington D. C. :Opt.Soc.Am.,1990,7:250

[9] [9] Herbert T, Wannemacher R, Macfarlane R M et al.. Blue continuously pumped upconversion lasing in Tm:LiYF. Appl. Phys. Lett.,1992,60(21):2592～2594

[10] [10] Francois V, Pellé F, Goldner P et al.. Pump-probe measurement of the avalanche up-conversion gain inTm3+YLF. J. Lumin.,1995,65(2):57～63

[11] [11] Kueny A W,Casr W E, Koch M E. Infrared-to-ultraviolet photon-avalanche-pumped upconversion in Tm: LiYF4. J. Opt. Soc. Am. (B),1993,10(10):1834～1839

[12] [12] Guy S, Joubert F, Jacquier B. Blue upconverted fluorescence via photon-avalanche pumping in YAG: Tm. Phys. Stat. Sol. (B),1994,183(1):K33～K36

[13] [13] Ni H, Rang S C. Avalanche upconversion in TmYAlO3. Opt. Lett., 1991,16(18):1424～1426

[14] [14] Collings B C, Silversmith A J. Avalanche upconversion in LaF3Tm3+. J. Lumin.,1994,62(6):271～279

[15] [15] Bouffard M, Jouart J P, Mary G. Photon avalanche in Tm doped CdF2. Phys. Stat. Sol. (B),1996,193(1):239～245