激光加热基座法生长高质量Yb3+掺杂Y3Al5O12单晶光纤

单晶光纤即具有光纤形态的单晶材料,是功能晶体材料一维化发展的重要体现.单晶光纤兼具单晶材料优异的光学性能和激光光纤散热效率高、光束质量高等特点,有望解决传统玻璃材质激光光纤非线性效应强、热导率低等瓶颈问题,实现激光峰值功率、脉冲能量等性能的突破.本工作采用自主研制的激光加热基座(Laser-heated Pedesta...

Growth of High-quality Yb3+-doped Y3Al5O12 Single Crystal Fiber by Laser Heated Pedestal Growth Method

Single-crystal fiber (SCF) is a fiber-shaped monocrystalline material, which is an important tendency for the development of low-dimensional functional crystals. Combining the excellent optical properties of bulk crystals and the high-efficient thermal dissipation as well as the high beam quality of optical fibers, SCFs are believed to solve the bottlenecks of conventional laser fibers such as unfavorable non-linear effects and poor thermal conductivities, can thus achieve higher laser peak powers and pulse energy. Here, we describe the results of synthesis and characterization of two Yb³⁺-doped Y₃Al₅O₁₂ (Yb:YAG) SCFs (Ф0.2 mm×710 mm), which were grown by a self- developed laser-heated pedestal growth (LHPG) apparatus. The prepared SCFs possess a length-to-diameter ratio greater than 3500, a diameter fluctuation less than 5%, and show high flexibility for bending. The analysis of X-ray rocking curve indicates that the crystallinity of the grown SCF is improved compared with that of the source rod. The EDS line scan shows that the Yb³⁺ ions are uniformly distributed along the axial direction. Results of these characterizations of SCFs indicate that SCFs maintains excellent crystallinity and high optical homogeneity, showing promising candidate for high-power laser applications.