本文从固相反应温度、晶转速率、生长速率及降温速率几个方面,探索分析了采用提拉法生长大尺寸Yb∶CALGO晶体的工艺。通过对比不同温度下烧结反应后的多晶料XRD图谱发现,原料在1350℃可以充分反应,根据所生长晶体的开裂截面形貌与晶体...本文从固相反应温度、晶转速率、生长速率及降温速率几个方面,探索分析了采用提拉法生长大尺寸Yb∶CALGO晶体的工艺。通过对比不同温度下烧结反应后的多晶料XRD图谱发现,原料在1350℃可以充分反应,根据所生长晶体的开裂截面形貌与晶体表面光滑度来优化晶转速率和生长速率,通过变温拉曼光谱分析降温速率导致开裂的成因,结合不同降温速率获得了不同方向的晶面应力分布图,发现对于沿着c轴生长的Yb∶CALGO晶体来说,降温速率过快更容易导致(001)面的热应力积累,这也是导致晶体在退火过程中开裂的主要诱因。采用多种手段优化晶体生长工艺后,实现了ϕ50 mm×110 mm Yb∶CALGO晶体的稳定生长,晶体具有较低的散射损耗(0.001796 cm^(-1))和较高的光学均匀性(4.21×10^(-5)),可以实现多种尺寸和形状的晶体元件加工,为进一步研制Yb∶CALGO板条激光器和超快激光器提供技术支撑。展开更多
Bi 12 TiO 20 (BTO)crystals have same structure as that of the Bi 12 SiO 20 (BSO)which is one of the most popular photorefractive materials.And both of them belong to cubic non centrosymmetric nonferroelectric material...Bi 12 TiO 20 (BTO)crystals have same structure as that of the Bi 12 SiO 20 (BSO)which is one of the most popular photorefractive materials.And both of them belong to cubic non centrosymmetric nonferroelectric materials.The cubic nonferroelectric oxides exhibit a number of advantages such as higher sensitivity and faster respond for applications in photorefractive.Compared to BSO,BTO have the largest electro optical coefficient and lower optical activity,especially it exhibits much high photosensitivity in the red light region that permits to use a cheap He Ne laser.It is,therefore,of high potential for applications in optical devices.展开更多
文摘本文从固相反应温度、晶转速率、生长速率及降温速率几个方面,探索分析了采用提拉法生长大尺寸Yb∶CALGO晶体的工艺。通过对比不同温度下烧结反应后的多晶料XRD图谱发现,原料在1350℃可以充分反应,根据所生长晶体的开裂截面形貌与晶体表面光滑度来优化晶转速率和生长速率,通过变温拉曼光谱分析降温速率导致开裂的成因,结合不同降温速率获得了不同方向的晶面应力分布图,发现对于沿着c轴生长的Yb∶CALGO晶体来说,降温速率过快更容易导致(001)面的热应力积累,这也是导致晶体在退火过程中开裂的主要诱因。采用多种手段优化晶体生长工艺后,实现了ϕ50 mm×110 mm Yb∶CALGO晶体的稳定生长,晶体具有较低的散射损耗(0.001796 cm^(-1))和较高的光学均匀性(4.21×10^(-5)),可以实现多种尺寸和形状的晶体元件加工,为进一步研制Yb∶CALGO板条激光器和超快激光器提供技术支撑。
文摘Bi 12 TiO 20 (BTO)crystals have same structure as that of the Bi 12 SiO 20 (BSO)which is one of the most popular photorefractive materials.And both of them belong to cubic non centrosymmetric nonferroelectric materials.The cubic nonferroelectric oxides exhibit a number of advantages such as higher sensitivity and faster respond for applications in photorefractive.Compared to BSO,BTO have the largest electro optical coefficient and lower optical activity,especially it exhibits much high photosensitivity in the red light region that permits to use a cheap He Ne laser.It is,therefore,of high potential for applications in optical devices.
