Yb: The The Gdvo <sub> 4 </ Sub> Laser Crystal Growth And Spectroscopic Properties Of The Study

This thesis reports the growth, spectral properties of YbxGd1-xVO4, NdxYbyGd1-x-yVO4, YbxEryGd1-x-yVO4 and YbxGd1-x-yLayVO4 crystals.The polycrystalline material was synthesized by the liquid-phase reaction method and the single crystals were grown by the Czochralski method. The segregation coefficients of the dopant ions in GdVO4 crystal were calculated in terms of the component analyses by ICP. The positions of the X-ray power diffractionpeaks are quite consistent with the JCPDS date of GdVO4, from which the lattice structure parameters of the crystals were calculated. The laser damage threshold of the Yb∶GdVO4 determined by Nd:YAG laser, which showed a decreasing tendency with the increase of the dopant concentration.The polarization absorption spectra and the non-polarization fluorescence spectra of YbxGd1-xVO4 crystals and YbxGd1-x-yLayVO4 crystal were measured at room temperature, from which the Stark levels of the Yb3+ ion were concluded. There is concentration quenching on active ions in the crystals for Yb3+-doped concentration of more than 10at%. The spectra parameters of these crystals can be calculated by the method of reciprocity and the F-L formula, which show that the crystals are applicable for the tunable laser and femtosecond laser because of their large emission broadband (FWHM-46nm).The polarization absorption spectra and the non-polarization fluorescence spectra of the NdxYbyGd1-x-yVO4 and YbxEryGd1-x-yVO4 crystals were also measured at room temperature. The spectra parameters can be calculated according to the J-O theory. Energy transfer between donor and acceptor were investigated, and the efficiencies of energy transfer are 78% and 67% for Nd3+-Yb3+ and Yb3+-Er3+ respectively.