铌酸镓镧晶体生长及其中红外光参量振荡器件研究

激光是人类的伟大发明，发展半个世纪来，已获得重要应用。到目前为止，近红外波段发展成熟；由于系列“中国牌”非线性晶体的发现和应用，可见到紫外波段也趋于成熟；受限于优秀的非线性光学晶体，中红外（3-8μm）波段激光有待发展且有重要需求。. 声子能量低、透过波段宽、非线性系数大、光损伤阈值高的非线性光学晶体是中红外波段的理想材料。我们的前期研究发现，铌酸镓镧晶体具有上述优点，是潜在的中红外非线性晶体。本项目面向中红外波段亟需，优选铌酸镓镧晶体为研究对象，完善晶体生长工艺，提高晶体质量，全面表征该晶体的非线性光学性能，实现其器件的设计，突破中红外波段激光发展瓶颈，推动中红外波段激光器件和技术的发展。. 我们已经进行了前期预研，实现了4μm波段光参量产生，证明的本项目的可行性。拟开展研究工作从晶体生长做起，涉及晶体表征和器件设计，研究内容环环相扣，有重要科学和现实意义。

Laser is one of the greatest inventions in the human-being history. It has been utilized in kinds of critical fields after several decades’ development. Up to now, the lasers in near infrared range have developed to maturation and thanks to the inventions and applications of series of Chinese brand nonlinear crystals, the lasers in visible and violet range are getting mature. While districted by lack of excellent nonlinear optical crystals, the lasers in mid-infrared range (3-8μm) which have many significant requirements are still in progress. The nonlinear optical crystals with low phonon energy, wide transmission range, large nonlinear coefficient and high optical damage threshold are ideal media in mid-infrared applications. Our previous fundamental study indicates that the langanite crystal possess such advantages and could be a potential mid-infrared nonlinear optical crystal. .This project will optimize the langanite crystal as the research object aiming at the desiderating in mid-infrared range, improve the crystal growth technique and the optical quality, comprehensively characterize the nonlinear optical properties, and finally realize the device design. This project is predicted to break the restrictions in the development of mid-infrared lasers and promote the evolution of the mid-infrared laser devices and techniques. .The previous study of us has realized the optical parametric generation at 4 μm which verified the feasibility of this project. The proposed study will begin with the crystal growth and proceed with the characterization of the properties and device design. All the research details are linked with each other and possess significantly scientific and practical meanings.