近化学计量组分掺铒铌酸锂晶体光学特性研究

用气相输运平衡技术成功地制备出了近化学计量组分的Er∶LiNbO₃晶体,系统 地研究了该 晶体的吸收边移动、可见—红外透射谱、荧光光谱的物理特性.与同成分Er∶LiNbO_{3晶体 相比, 近化学计量组分Er∶LiNbO3晶体的吸收边出现了“蓝移”;OH^{-吸收带明显减弱 ;在可见—近红外波段呈现出更高的透过率;同时Er3+离子的发光强度也明显 提高. 这些结果表明近化学组分的Er∶LiNbO关键词： 近化学组分掺铒铌酸锂晶体 -}吸收带')" href="#">OH^-吸收带 透射谱 荧光光谱}

Study on optical properties of Er3+-doped near-stoichiometric LiNbO3 crystals

Near-stoichiometric Er∶LiNbO₃ has many properties superior to the co ngruent one and has aroused extensive interest. It was obtained by the technique of vapor transport equilibration (VTE), its optical properties, including OH^- absorption spectra, transmission spectra, emission spectra and the position of absorption edge were studied. The higher transmittance, the narrower of the peak width, the “blueshift" of the optical absorption edge, as well as the significant reduction of the OH^- absorption band are indicative of the VTE treatment having brought the crystal closer to the stoichiometric composition. We also observed the increase of Er³⁺ luminescent intensity, and predicted that the VTE treatment must lead to the increase of fluorescence lifetime. The possible modification of materials in amplifier, self-frequency doubling laser and waveguide laser etc were expected.