[1] Auzel F E.Material and device using double-pumped phosphors with energy transfer.Proc IEEE, 1973,61(16):758

[2] Oliverira A S,Araujo M T,Gouveia-Neto A S,et al.Frequency up-conversion in Er3+/Yb3+doped chalcogenide glass.Appl Phys Lett,1998,72(7):753～755

[7] Denk W, Strickler J H, Webb W W.Two-photon laser scanning fluorescence microcopy.Science,1990,48(4951):73～76

[8] He G S, Gvishi R, Prasad P N,et al. Two-photon absorption based optical limiting and stabilization in organic molecule-doped solid materials.Opt Comm, 1995,117(1-2):133～136

[9] Ehrlich J E, Wu X L, Lee I Y S,et al. Two-photon absorption and broadband optical limiting with bisdonor stilbenes.Opt Lett, 1997,22(24):1843～1845

[10] Strickler J H, Webb W. Three-dimensional optical data storage in refractive media by two-photon point excitation.Opt Lett,1991,16(22): 1780～1782