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GROWTH,STRUCTURE AND SPECTRAL PROPERTIES OF Nd~(3+…
Author:LINHai1 ZHANGYing1 LIChun1 ZENGFanming1 QINJieming1 MAUROTonelli2 IUJinghe1(1.Schoolof… ChangchunUniversityo… Changchun130022 China 2.TheDepartmentofPhy… TheUniversityofPisa Pisa56127 Italy) 
Unit: 
Keyword:neodymium doped gadolinium sodium tungstate crystal Czochralski method infrared 
Classification:O782
Year,volume(Issue):page number:2010,38(2):177-182
Summary:

Nd:NaGd(WO4)2 (Nd:NGW) single crystals with 30-35 mm in diameter and 80 mm long were grown by Czochralski method.The optimal growth parameters of the Nd:NGW crystal are:a pulling rates of 1-2 mm/h,a rotation rate of 15-18 r/min,a cooling speed of 10 ℃ /h and an axial temperature gradient on the solid-liquid interface of 0.7-1 ℃ /mm.The crystal was characterized by thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD).The infrared (IR) spectra and Raman spectra of the crystal were measured,and vibration frequencies of IR and Raman active modes for the crystal were assigned.TG-DTA curves indicate that the melting point of the Nd:NGW crystal is 1 251.7 ℃.The XRD analysis shows that the Nd:NGW crystal belongs to a tetragonal system with a scheelite-type structure and a space group I41/a,and the lattice parameters of the crystal are a=0.532 13 nm and c=1.130 70 nm.Absorption optical spectra of the Nd:NGW crystal show that there is better and wider absorb peak at about 805 nm,and the absorption cross-section of crystal sample is calculated to be 3.581 × 10-20cm2,which is suitable for laser diode pumping.

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