The Research On Growth And Optical Property Of Novel Molybdate Laser Crystal Doped With Ytterbium

At present,the molybdate is on focus in the area of laser crystal.Because it has big emission cross-section and wide absorption,emission bandwidth for femto-second laser,the disordered structure for high concentration doped with Yb³⁺,and the feature of self-tuning by birefringent.Though,these excellent properties interested lots of scientist, it also has the problem of layered structure,difficult to grow and bad thermal property etc.In this paper,we concluded the research results of molybdate at home and abroad. In order to modify the property of molybdate,we made the research plan of using the WO₄^2- and PO₄^3- to synthesis the compound-acid ions material.Then we gain some important conclusions:1.we have grown five types of double-molybdate-tungstate, double-mo lybdate-pho sphate and quadruple-molybdate-tungstate polycrystalline materials and crystal by heating furnace and czochralski furnace;2.we characterize the five materials respectively by XRD for structure and chemical phase,DSC-TG for melting point and thermal property,absorption and emission spectrum;3.the WO₄^2- can inhomogeneous broaden the absorption bandwidth,which can reach to 80nm,and the absroption spectrum contains the emission spectrum of 980nm LD pumped source.It can impove the thermal property of molybdate indirectly;4.the compound-acid molybdate-tungstate belongs to I4₁/a space group of tetragonal system and the compound-acid molybdate-phosphate belongs to Ibca space group of orthorhombic system;5.the fluorescence lifetime of compound-acid molybdate-phosphate can reach to 1002.5μs,with the property of high energy storage;6.the polycrystalline materials is synthesized by melting and TSSG and the crystal was grown by CZ method.And the Na₅La(MoO₄)₄ is easy to crystallize;7.during the course of solid state reaction,the middle product Na₂MoO₄ is produced,and it can be used as fluxing agent;8.the future work plan is presented.