近化学计量比掺镁铌酸锂晶体的抗光折变性能(英文)  

Photorefraction-resistance Property of Mg-doped Near Stoichiometric Lithium Niobate Crystals

作　　者：孔勇发[1] 许京军[1] 刘宏德[1] 王岩[1] 阎文博[1] 谢翔[1] 黄自恒[1] 陈绍林[1] 张光寅[1] 

机构地区：[1]南开大学物理科学学院光电材料研发中心,天津300071

出　　处：《人工晶体学报》2004年第4期586-590,共5页Journal of Synthetic Crystals

基　　金：theNationalNaturalScienceFoundationofChina (No .60 1 0 80 0 1and 90 1 0 1 0 2 2 ),theNationalAdvancedMaterialsCommitteeofChina (2 0 0 1AA31 30 2 0 ),andChinaKeyBasicResearchProject (G1 9990 30 0 4 )

摘　　要：应用气相传输平衡技术 ,我们获得了 3种近化学计量比掺镁铌酸锂晶体 ,晶体的掺镁量接近我们以前提出的第二阈值。在我们实验室所能达到的最大光强 2 6MW/cm2 照射下 ,在所有近化学计量比掺镁铌酸锂晶片中没有观察到光斑畸变 ,该光强比同成分铌酸锂晶体所能承受的光强高 6个量级 ,为目前已报道的铌酸锂晶体之最。应用双光束全息写入法测得掺 1.0mol%Mg近化学计量比铌酸锂晶体的光折变饱和值仅有 4 .6× 10 -7,比同成分铌酸锂晶体小两个量级 ,从已有实验数据推测 ,该晶体的抗光折变能力应当比同成分铌酸锂晶体高 9个量级以上。With the help of vapor transport equilibrium technique, we obtained three near stoichiometric lithium niobate crystals with the doping concentration of Mg near the second threshold. These crystals show, up to now, the best resistant ability against laser induced optical damage: no laser beam distortion was observed under a light intensity of 26 MW/cm^2, and only a Δn of (4.6×10^(-7)) was measured by two-beam holographic recording.

关 键 词：近化学计量比 抗光折变性 掺镁铌酸锂晶体 气相传输平衡技术 

分 类 号：O73[理学—晶体学]