Influence of Mg/Er co-doping on the principal laser parameters of LiNbO3 crystals

✍ Scribed by Liang Sun; Haitao Yu; Qiang Lv; Fengyun Guo; Hongtao Li; Wei Cai; Yuheng Xu; Liancheng Zhao

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 211 KB
• Volume: 42
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200610896

✦ Synopsis

Mg: Er: LiNbO 3 crystals were grown by the Czochralski technique with various concentrations of MgO = 2 mol%, 4 mol%, 6 mol% and the fixed concentration of Er 2 O 3 = 1 mol% in the melt, and the 8 mol%Mg: 1 mol%Er: LiNbO 3 crystal was fabricated by the Czochralski technique with special technology process. The crystals were treated by polarization, reduction and oxidation. The segregation coefficients of Mg 2+ and Er 3+ in Mg: Er: LiNbO 3 crystals were measured by X-ray fluorescence spectrograph, as well as the crystal's defect structure and optical properties were analyzed by the UV-Vis, IR and fluorescent spectroscopy. The pump wavelength and the surge wavelength were determined. Using m-line method tested optical damage resistance of those crystals, the results show that photodamage threshold of Mg: Er: LiNbO 3 crystals are higher than that of Er: LiNbO 3 crystal, and the oxidation treat could enhance the photodamage resistant ability of crystals while the reduction treat could depress the ability. The optical damage resistance of 8 mol%Mg: 1 mol%Er: LiNbO 3 crystal was the strongest among the samples, which was two orders magnitude higher than that of 1 mol%Er: LiNbO 3 crystal. The dependence of the optical properties on defect structure of Mg: Er: LiNbO 3 crystals was discussed.