Investigations of YAG:Er~(3+),Yb~(3+) and YAG:Co~(2+) crystals for laser application

摘要

The results of examinations of spectroscopic properties and generation parameters of new active media, i.e., Er~(3+) and Yb~(3+) doped YAG crystals are given. Erbium and ytterbium doped YAG single crystals were obtained by the Czochralski method. The spectral properties and laser characteristics were investigated. Absorption spectra of Er~(3+) and Yb~(3+) - doped active media were measured in the spectral range 190 ÷ 5000 nm at room temperature. Excitation and luminescence spectra were also recorded at room temperature with a JOBIN-YVON spectrofluorimeter using a diode laser (POLAROID 4300, 980 nm, 1 W) as an excitation source. The measurements of the lifetime of the Er~(3+) ions in the upper laser level (~4I_(13/2)) of the samples were made by the direct method with pulse excitation. We present also the results of investigations on spectroscopic properties and non-linear absorption effect in YAG: Co~(2+) crystal - new absorber used for the systems generating giant-pulse radiation at 1.5 μm.