本文研究了掺钕钽酸锂晶体背散射几何组态下的喇曼光谱，与纯钽酸锂晶体的喇曼光谱相比，发现喇曼谱中不仅有E(LO+TO)模向A1(TO)模的转变，而且还有新振动模的出现和部分振动模强度的变化，本文用光折变理论结合掺杂后晶体微观结构的改变对实验结果作了分析和探讨.

Raman spectra of Nd-doped LiTaO3 have been studied at backscattering geometries. In comparison with those of pure LiTaO3, it is found that not only E(TO+LO) modes turned into Al (TO) modes in partial geometries but also new vibrational modes appeared and intensities of some modes changesed. We attribute the phnomena to the stronger photo- induced refractive index change and the changes ofLiTaO3 microstructure resulted from doping Nd.