高熔点稀土氧化物激光晶体的研究进展

Research Progress on High-Melting-Point Rare Earth Oxides Laser Crystals

高熔点稀土氧化物因具备高热导率、高机械强度、低声子能量及较大的阳离子位点密度等优势,表现出大分凝系数、强电声子耦合及多晶格位点等特性,已成为高功率、超快及红外波段激光晶体研究的热点。然而,高熔点稀土氧化物熔点较高,特别是稀土倍半氧化物(约2450℃),晶体的生长十分困难。因此,尽管首次报道高熔点稀土氧化物晶体已过去数十年,但其发展至今仍处于初步阶段。近年来,随着对多种晶体生长技术的不断探索与优化,高熔点稀土氧化物的生长技术取得了突破,稀土离子掺杂的激光研究也愈加多样化。本文在总结高熔点稀土氧化物性能优势及晶体生长进展的基础上,重点介绍了在红外1、2、3μm波段的高熔点稀土氧化物激光性能研究进展。

High-melting-point rare earth oxides,due to their advantages of high thermal conductivity,high mechanical strength,low phonon energy,and high cation site density,exhibit characteristics such as large segregation coefficients,strong electron-phonon coupling,and multiple lattice sites.These properties have made them a hot topic of research in high-power,ultrafast,and infrared laser crystals.However,their high-melting-points,particularly for sesquioxides(~2450℃),pose significant challenges for crystal growth.Though being reported decades ago,the development of sesquioxide crystals remains in its early stage.In recent years,breakthroughs in various crystal growth techniques have been achieved,leading to a diversification of rare earth ion-doped laser research.This paper reviews the advantages of high-melting-point rare earth oxides,recent advancements in crystal growth,and the progress in laser performance across the infrared 1,2 and 3μm wavelength bands.