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研究了纯LiNbO3晶体和由己二酸与苯甲酸的混合摩尔比分别为30%和80%时的质子源质子交换制作的LiNbO3晶体的拉曼散射光谱。实验结果表明,纯LiNbO3晶体的拉曼光谱在0～1000cm-1的波数范围内有11个拉曼峰,这些拉曼振动模式主要由[NbO6]氧八面体的振动产生的;而质子掺杂的LiNbO3晶体的拉曼光谱,在谱线的形状和数量方面,除了与纯LiNbO3晶体的拉曼峰相同外,还发现了一个与晶体本征缺陷相关的局域模672cm-1峰,它的相对强度随着本征缺陷的程度的增加而增大,同时掺质子的浓度较大时,多数拉曼谱峰位置向高波数方向稍微移动。实验还表明,掺杂质子浓度越大,波导的模数越多,表面折射率变化、波导深度越大。
The Raman scattering spectra of pure LiNbO3 crystals and LiNbO3 crystals prepared by proton source proton exchange at a mixed molar ratio of adipic acid to benzoic acid of 30% and 80%, respectively, were studied. The experimental results show that the Raman spectrum of pure LiNbO3 crystal has 11 Raman peaks in the wavenumber range of 0 ~ 1000cm-1. These Raman modes are mainly generated by the vibration of the [NbO6] oxygen octahedron. The proton doping Of the Raman spectrum of LiNbO3 crystals, in terms of the shape and number of lines, in addition to the same Raman peaks of pure LiNbO3 crystals, but also found a localized mode associated with crystal intrinsic defects 672cm-1 peak, its The relative intensities increase with the increase of intrinsic defects, and at the same time the concentration of proton increases, the positions of most Raman peaks shift to higher wave numbers slightly. Experiments also show that the larger the concentration of doped proton, the more the waveguide modulus, the surface refractive index changes, the greater the depth of the waveguide.