The Study On New Laser Crystal Nd:GdVO₄

It i s that the emergence and fast development of the high power laser diode provided terms for researching new laser crystals．Nd:GdV04 is a material of new laser crystal that been discovered under this kind of background．In this text,it introduced the latest research trend for laser crystals and the development progress of Nd:GdV04 crystal．GdV04 crystal belongs tO tetragonal system,has zircon structure, space group is D 419^一14l／amd．According to the cultural heritages,a series of different Nd针ion-doped concentrations GdV04 single crystals were grown by Czochralski method with technique parameters---'pulling rate was 2mm／h,rotation rate was fOr．P．m．The Nd。'ions concentrations were obtained by ICP-AES method,the efficient distribution coefficient of Nd针was calculated according to it．Its value was 0．74,SO it can be doped with high concentrations．At the salile time,chemical etching techniques were used to reveal the dislocation structure of crystals,the dislocation density was counted,and has been founded that dislocation reduced by anneal ing．Absorption spectra of Nd:GdV04 were measured at room temperature． It has a wide absorption band near 808nm,SO it is fit to be pumped by 808nm LD,And the energy level distribution of the Nd针ions in GdV04 were confirmed,Nd absorption cross section was 3．261×i0一。。cm。。Four peaks can be observed in the fluorescence spectra,the intensity of 1064nm luminescence was the strongest among them．Worthy of remark specially is that the stronger fluorescent line at 912．4nm,it can be achieved high blue laser at 456nm after double frequency．The emission section was 9．283×10一。。cm。at 1064nm．Laser performance was tested by LD．The slope efficiency of Nd:GdV04 crystal was much hi gher than Nd:YV04 at the same condi t i ons,and even the highest value was up to 47．3％．Along with the enhancement of pump power,the crystal'S laser slope efficiency was increased too．It is fit to be applied to high power lasers．...