Luminescence Investigation Of Yb/Er Co-Doped Waveguide Materials And Optimum Designs Of Amplifier

The five series for the Yb/Er co-doped Al₂O₃ films with constant Er concentration have been prepared, on the SiO₂/Si wafer, by medium frequency magnetron sputtering (MFS). The experimental parameters are optimized, and the results analyzed by SEM and EPMA show the superiorities. The photoluminescence (PL) of the thin films between 1.430μm and 1.630μm are investigated at room temperature. Experimental results show, Ytterbium co-doping efficiently increases the PL peak intensity, and the PL intensity of optimal concentration for 1.00at% Er and Yb:Er ratio of 10:1 enhance by a factor of about 40, compared with that of 1.00at% Er doped film;there exists the optimal Yb/Er ratio with constant Er concentration, this mainly is an interacting result of energy transfer and back energy transfer between Yb and Er, whereas the optimal Yb/Er ratio decrease with increasing the Er concentration;the change trend of PL peak intensity for only Eroped film is similar with Guass figure whereas that for Yb/Er co-doped film is similar with anti-Guass figure as a function of Er concentration. In addition, the Yb/Er co-doped Al₂O₃ films are prepared by microwave electron resonance plasma source (ECR-MW) and the PL of it are investigated.The non-uniform Yb/Er co-doped Al₂O₃ films have been originally prepared by medium frequency magnetron sputtering. The two different targets of this system are critical to realize non-uniform doping. By changing the distance between sample table and targets, three different change curves of photoluminescence peak intensity are presented, and the change curve of distance for 3.4cm keeps good consistency, for the sample of Er 1.67at% and Yb 12.00at%. In addition, the non-uniform films of another two Er concentrations with constant Yb concentration are discussed. By combing the non-uniform doped originality and laser annealing process, more non-uniform doped designs can be realized.Many methods of the couple between the fiber and EDWA are introduced, including Plannar Lightwave Circuit (PLC) alignment system. The four folded designs of EDWA are presented optimally, and the samples are achieved by BC13 ions and investigated. Then, we prepare the gain measurement of those EDWAs.1.54μm fluorescence lifetimes of Er doped and Yb/Er co-doped silicate glasses are measured. Experiments show: the kinetics of luminescence delay is well described by an exponential function with a single time constant, lifetime is on the order of ms;fluorescence lifetime of samples decrease with concentration of only Er doped but change inconspicuouslywith concentration of Yb under constant Er concentration, meanly as energy of excited Er is coupled to quenching site by indirect couple;the lifetime of two samples is independent of power in the range under study. For the samples of Er 0.5at% and Yb 3.0at%, frequency upconversion fluorescence emissions are experimentally investigated. Visible emissions centered at 525nm, 543nm, and 660nm, corresponding to 2Hnn^<sup>* lisa, S3/2^*4Ii5/2, and 4F9/2"^-4Ii5/2 transitions of Er ions, respectively, are simultaneously observed in Yb/Er co-doped silicate glass at room temperature. The upconversion mechanisms and power dependence are presented. The quadratic dependences of the green and red emissions on excitation power reveal that biphotonic processes occur.