1.Applied Optics Beijing Area Major Laboratory, Physics Department and Analysis and Testing Center, Beijing Normal University, Beijing 100875, China 2.Physics School, Peking University, Beijing 100871, China 3.Sumita Optical Glass, Inc., 4-7-25 Harigaya, Urawa, Saitama, 338, Japan
Abstract：The upconversion luminescence of nanophase oxyfluoride vitroceramics Tm(0.35)Yb(5)∶FOV when excited by a 975 nm diode laser was studied in the present paper.Several ultraviolet upconversion luminescence lines positioned at 363.6 nm, (462.6 nm, 477.0 nm), 648.7 nm, (699.7 nm, 680.7 nm) and (777.6 nm, 800.7 nm) were found.They can be attributed to the fluorescence transitions of 1D2→3H6，1G4→3H6, 1G4→3F4, 3F3→3H6 and 3H4→3H6 of Tm3+ ion.The careful measurement and analysis of the variation of upconversion luminescence intensity F as a function of the 975 nm pumping laser power P has proven that the upconversion luminescence of 1D2 state is partly a five-photon upconversion luminescence, while the upconversion luminescence of 1G4 and 3H4 state is the three-photon and two-photon upconversion luminescence respectively.
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