蓝光弱吸收泵浦的Pr^(3+):YLF红光激光器性能研究  

Properties of Pr^(3+)∶YLF Red Laser with Weak Blue Absorption Pumping

作　　者：江泽茜 李丙轩[1,2,3] 廖文斌 张戈[1,2,3] Jiang Zeqian;Li Bingxuan;Liao Wenbin;Zhang Ge(Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,Fujian,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,Fujian,China;Key Laboratory of Optoelectronic Materials Chemistry and Physics,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,Fujian,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院福建物质结构研究所,福建福州350002 [2]闽都创新实验室,福建福州350108 [3]中国科学院福建物质结构研究所光电材料化学与物理重点实验室,福建福州350002 [4]中国科学院大学,北京100049

出　　处：《中国激光》2024年第13期9-14,共6页Chinese Journal of Lasers

基　　金：中国科学院青年创新促进会项目(2022303);中国科学院技术支撑人才专项(2022000061);国家自然科学基金(U21A20508,61975208,62105334);中国科学院科研仪器设备研制项目(YZLY202001);中国福建光电信息科学与技术创新实验室项目(2021ZR203,2020ZZ108,2021ZZ118);福建省自然科学基金(2021H0047)。

摘　　要：报道了基于蓝光半导体泵浦的掺镨氟化钇锂(Pr^(3+):YLF)红光640 nm激光器,对泵浦方式、热效应等因素引入的影响进行了分析与讨论。为缓解热效应对激光器输出功率性能的影响,采取弱吸收泵浦方式,泵浦中心波长为449.3 nm,对应激光器中Pr^(3+):YLF晶体的弱吸收峰。为研究热透镜和泵浦光束等对输出性能的影响,实验中采用不同耦合透镜组改变泵浦光束,对不同耦合比下的热透镜效应及泵浦光束与晶体的匹配程度等进行了研究,最终获得了最大输出功率为2.46 W、斜效率为36.8%的Pr^(3+):YLF红光激光器。Objective The development of the blue laser diode has made the visible solid-state laser generated by rare-earth-ion-doped material using laser diode (LD) pumping a research hotspot.Materials doped with trivalent praseodymium ions Pr^(3+)are prospective gain material in the visible range,and yttrium lithium fluoride (Pr^(3+)∶YLF) exhibits good output performance under blue LD pumping owing to its low phonon energy.Moreover,Pr^(3+)∶YLF provides multiple emission wavelengths including green,orange,red,and deep red light wavelengths.To meet actual requirements,the output laser can be designed to achieve different wavelengths and polarization states.Thus,Pr^(3+)∶YLF has become a common topic in the research on solid state lasers in the visible range.By contrast,ultraviolet and deep ultraviolet lasers are obtained by infrared light.Research and application progress in visible lasers has provided another scheme towards ultraviolet laser generation,which is directly performing frequency doubling of visible lasers to obtain ultraviolet lasers.Under these circumstances,we study the laser properties of Pr^(3+)∶YLF crystal using a weak absorption pumping strategy.In this strategy,the band is pumped with weaker absorption in the crystal,reducing the amount of pump energy absorbed by the crystal and alleviating the thermal stress caused by uneven heat distribution.By quantitatively changing the pump spot size and beam distribution in Pr^(3+)∶YLF,different output results are obtained.The influence of factors such as pump beam distribution on laser output is analyzed and discussed,and the conditions for high-quality operation of visible lasers are explored.Methods Despite good laser properties,the negative influence of the thermal effect of YLF crystals is poor,especially in terms of the crystal fracture caused by thermal stress.This is the primary concern restricting studies on YLF crystals.The thermal effects of a laser gain medium mainly include thermal photorefraction,thermal stress,and thermal lens.To reduce the

关 键 词：激光器 红色激光 Pr^(3+):YLF晶体 弱吸收泵浦 热效应 

分 类 号：O432.12[机械工程—光学工程]