晶体拉曼激光技术是拓展激光波长覆盖范围的有效手段之一。开发性能优异且适合LD泵的自拉曼激光晶体符合当今新波长全固态激光器集成化、小型化的发展趋势和要求。Na2La4(WO4)7晶体物化性能和机械性能优良,具有特殊的含阳离子空位非对称畸变白钨矿结构，其[WO4]阴离子基团呈现出优异的拉曼活性，是一种极具研究价值的激光晶体基质材料。本项目以Re3+:Na2La(4-x)Bax(WO4)7(Re=Nd,Yb)自拉曼激光晶体为研究对象，通过对晶体的结构进行分析与计算以及对晶体原料的合成、生长、光谱与拉曼特性和自拉曼激光实验等方面的研究来揭示Ba2+离子对结构和自拉曼性能影响规律与机理，从而达到通过Ba2+含量对晶体进行结构调控与优化，使激活离子的光谱性能和[WO4]基团的拉曼性能达到最佳，实现1.1-1.5μm波段自拉曼激光输出，开发出性能优异且具有自主知识产权的自拉曼激光晶体的目的。

Crystalline Raman technique can significantly extend the spectral coverage of solid-state lasers, which has important applications in various fields. Searching for good self-Raman laser crystals is consistent with the trend in developing integrated and miniature all-solid-state lasers operating in the new wavelengths, and becomes the research hotspot and difficult point in the related areas. Na2La4(WO4)7 crystal has the incommensurately modulated scheelite-type cation-deficient structure, in which the [WO4] anionic groups exhibit excellent Raman scattering activity. In addition, this crystal has good thermal and mechanical properties which make it possible to be a kind of efficient laser host material. With the idea of combining the good features of Na2La4(WO4)7 and BaWO4, this proposal tent to use the structure-controlled method by adding Ba2+ ions into Nd3+/Yb3+:Na2La4(WO4)7, to improve the Raman properties of [WO4] anionic groups, keeping its excellent physical, chemical and optical characters at the same time. The Czochralski method is chosen to grow the crystals and, the synthesis of the raw materials, growth rate, morphology of the crystal and other factors chich are ralerative with the quality of the crystals will be focused on. The optical spectroscopy properties of Re3+:Na2La(4-x)Bax(WO4)7 (Re=Nd, Yb) self-Raman crystals will be studied by measurements of absorption, emission spectra. Raman characters are revealed from the Raman spectra. How the structure affects the optical and Raman properties will also be calculated and discussed concretely, which is crucial to determine the amount of Ba2+ ions in the crystal. Results and knowledge arising from the proposal research will also contribute to the pursuit of new prominent self-Raman laser crystals.