Investigation of Nd:Yb - codoped silica fibers as a laser material
The increasing interest in high power fiber lasers is connected with the task of providing the necessary pump energy at acceptable costs. High power laser experiments with commercially available multi-wavelengths diode laser systems and silica fibers codoped with Neodymium (Nd) and Ytterbium (Yb) demonstrated the potential of this laser concept. Fluorescence investigations of Nd:Yb-codoped silica fibers proved an effective energy transfer from stimulated Nd ions to Yb ions. To get a better understanding of this laser medium we investigated the fluorescence spectra, the fluorescence decay and the laser characteristics both experimentally and theoretically. In conclusion, we present experimental results and a model for the understanding of fluorescence and laser properties of Nd:Yb-codoped silica fibers
Spectroscopy of Nd3+ and Yb3+ codoped fluoroindogallate glasses
The Nd–Nd and Nd–Yb energy transfer processes are studied in lead fluoroindogallate glasses with the following molar composition: 30PbF2–20GaF3–15InF3–15ZnF2–(20–X)CaF2–XNdF3 (with X=0.1, 0.5, 1, 2, 4, and 5), 30PbF2–20GaF3–15InF3–15ZnF2–(20–X)CaF2–XYbF3 (with X=0.1, 0.5, 1, 2, 3, and 5), and 30PbF2–20GaF3–15InF3–15ZnF2–(19–X)CaF2–XYbF3–1NdF3 (with X=0.1, 0.5, 1, 2, 3, and 5.5). The Dexter, Yokota–Tanimoto, and Holstein formalisms were used to treat the experimental data. The following microparameters of energy transfer were obtained: CDD(Nd–Nd)≈7×10−40, CDA(Nd–Nd)=2.5×10−40, and CDA(Nd–Yb)≈3×10−40 cm6/s. It was also shown that the energy migration between Nd ions depends on the third power of temperature (T3) up to a saturation value of about 80 K. This behavior was attributed to the site to site energy migration. The Yb doped samples presented no nonradiative losses for the Yb3+ emission at 969 nm.
Spectroscopy of solids containing rare earth ions
Preface to the series. Preface. 1. P.P. Feofilov and the spectroscopy of activated crystals (A.A. Kaplyanskii and A.I. Ryskin). 2. Crystal field and electron-phonon interaction in the rare-earth ionic paramagnets (B.Z. Malkin). 3. Coherent transient and holeburning spectroscopy of rare earth ions in solids (R.M. Macfarlane and R.M. Shelby). 4. Experimental studies of energy transfer in rare earth ions in crystals (W.M. Yen). 5. Energy transfer in crystals (D.L. Huber). 6. Spectral migration of excitations in rare-earth activated glasses (T.T. Basiev, V.A. Malyshev and A.K. Przhevuskii). 7. Spectroscopy of collective states and co-operative transitions in disordered rare earth activated solids (V.V. Ovsyankin). 8. Ion-ion interactions and exciton effects in rare earth insulators (R.L. Cone and R.S. Meltzer). 9. Spectroscopic studies of Jahn-Teller phase transitions in rare earth crystals (R.T. Harley). 10. Studies of spin systems by means of light scattering in paramagnetic crystals (S.A. Al'tshuler, A.Kh. Khasanov and B.I. Kochelaev). 11. Electron paramagnetic resonance in the excited states of rare earth ions in crystals (R. Furrer). 12. Optical detection of spin-system magnetization in rare-earth activated crystals and glasses (V.S. Zapasskii). Author index. Subject index. Materials index. Cumulative index.