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Zirconium iron lithium niobate crystal growth and photorefractive properties of

Author: LinHongChang
Tutor: SunXiuDong
School: Harbin Institute of Technology
Course: Optics
Keywords: Zr: Fe: LiNbO3 crystal Crystal Growth Photorefractive properties Light-induced scattering
CLC: O782
Type: Master's thesis
Year: 2009
Downloads: 36
Quote: 1
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Abstract


Fe: LiNbO 3 crystal because of its high diffraction efficiency and sensitivity to become the most important one of the holographic storage material. However, Fe: LiNbO 3 crystal two shortcomings still exist, that the response time is long, and anti-light scattering ability is low. Therefore, the need to find a response speed and anti-light scattering ability than Fe: LiNbO 3 crystal holographic storage material. We have grown by Czochralski method in the melt [Li] / [Nb] ratios were 0.85,1.05 and 1.38 Zr: Fe: LiNbO 3 crystals. By inductively coupled plasma atomic emission spectrometry for crystal growth components were tested and the results showed that with the raw material [Li] / [Nb] ratio increases, the crystal [Li] / [Nb] ratio is also increased, while Zr and Fe in the crystal distribution coefficient decreases. The samples UV - visible absorption spectrum test results showed that with [Li] / [Nb] ratio increases, the absorption edge gradually purple shift. At room temperature, IR spectra of the samples tested, the infrared spectrum from the sample test results can be seen, with [Li] / [Nb] ratio increases, OH-absorption peak position no large movement, but the absorption peak intensity decreases. By two-wave coupling experiment Zr: Fe: LiNbO 3 photorefractive crystal properties were tested. In the same intensity, with the [Li] / [Nb] ratio increases, diffraction efficiency photoconductive increases, the response time becomes shorter, sensitivity is increased, the index gain coefficient decreases. With the total incident light intensity increases, the photoconductive material and the same dynamic range increases, the response time becomes shorter. While the two-wave coupled energy transfer direction of the optical excitation determined the crystal type carriers. We also studied the Zr: Fe: LiNbO 3 crystal light-induced scattering intensity threshold effect. All samples were obvious intensity threshold effect, and with the [Li] / [Nb] ratio increases, Zr: Fe: LiNbO 3 crystal anti-light scattering capacity is gradually increased, with the same composition Fe : LiNbO 3 crystals compared, Zr: Fe: LiNbO 3 crystals have a larger threshold intensity, better able to suppress light-induced scattering. Melt [Li] / [Nb] ratio of 1.38 of the sample having the largest light intensity threshold value, its value is up to 191mW/cm 2 . The results show that, Zr is an effective increase Fe: LiNbO 3 crystal light-scattering properties of anti-doping ions. Zr: Fe: LiNbO 3 crystal is a good volume holographic storage material.

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CLC: > Mathematical sciences and chemical > Crystallography > Crystal growth > Crystal growth process
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