28 January 2005 Study on SHG property of Mg: Nd: LiNbO3 crystal
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Abstract
The congruent Nd (Nd: 0. 2 wt %): LiNbO3 crystals doped with different concentration of MgO (MgO: 1, 3, 5,7mol %) have been grown by Czochralski method in air atmosphere. The crystals were made into samples after polarization, cut and polishing. The infrared absorption spectra of Mg: Nd: LiNbO3 crystals were measured by using Fourier transform infrared spectrophotometer. The OH- absorption peaks of Mg (1mol %): Nd (0.2wt %): LiNbO3 crystal and Mg (3mol %): Nd (0.2wt %): LiNbO3 crystal located at about 3481cm-1, while that of Mg (5mol %): Nd (0.2wt %): LiNbO3 crystal and Mg (7mol %): Nd (0.2wt %): LiNbO3 crystal shifted to 3536cm-1. The mechanism of OH- absorption peak shifting was studied. The resistance to photodamage of Mg: Nd: LiNbO3 crystals were measured by light spot distortion method. The results show that the photodamage threshold of Mg (5mol %) :Nd(0.2wt%):LiNbO3 was the highest(9.0×104W/cm2) among the samples. The mechanism of the photodamage resistance ability of Mg:Nd:LiNbO3 increasing was investigated. Using a Q adjustable Nd: YAG laser as pumping light, the second harmonic generation (SHG) properties, including the phase matching temperature and SHG conversation efficiency of Mg: Nd: LiNbO3 were measured by 90 degree angle phase matching technology. The results showed that the SHG conversation efficiency of Mg (5mol %): Nd (0.2wt %): LiNbO3 was the highest (52%) among the samples at 96°C.
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Zhaopeng Xu, Shiwen Xu, Xuandong Li, Yuheng Xu, Xinrong Liu, "Study on SHG property of Mg: Nd: LiNbO3 crystal", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.572595; https://doi.org/10.1117/12.572595
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