Growth and photorefractive properties of near-stoichiometric Pr:Ce codoping lithium niobate crystals

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• 作者：Zhaopeng Xu ; ^{xuzhaopeng1@163.com" class="auth_mail" title="E-mail the corresponding author} ; Xin Zhang ; Shudong Zhang ; Lijie Jin ; Jianqiang Tong ; Jie Gao
• 关键词：Optical materials ; Crystal growth ; Photorefractive properties ; Lithium niobate ; Near-stoichiometric
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：126
• 期：18
• 页码：1591-1594
• 全文大小：424 K

文摘

The congruent Pr(0.1 wt%):Ce(0.1 wt%):LiNbO₃ (PCLN) crystal and near-stoichiometric Pr(0.1 wt%):Ce(0.1 wt%):LiNbO₃ (PCSLN) crystal have been grown by the Czochralski method from melts having compositions of 48.6 and 58 mol% Li₂O, respectively. The Ultraviolet (UV)–Visible (Vis) absorption spectra and the OH⁻ absorption spectra were investigated to characterize the structure defects of the crystals. The UV–Vis absorption edges shift to shorter wavelength and the OH⁻ absorption peaks shift to longer wavelength as the [Li]/[Nb] ratio increases to stoichiometric. The photorefractive properties of the PCLN and PCSLN crystals were experimentally studied using the two-wave coupling method. The results show that as the [Li]/[Nb] ratio increases to stoichiometric, the holographic response time decreases; the diffraction efficiency, the photorefractive sensitivity and the dynamic range increase.