Tm∶YLF激光腔内泵浦2.1μm Ho∶YVO_(4)激光器  

Tm:YLF Laser Intracavity Pumped 2.1μm Ho:YVO_(4)Laser

作　　者：吴鸿春[1,2] Wu Hongchun(Key Laboratory of Research on Chemistry and Physics of Optoelectronic Materials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Science,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光电材料化学与物理重点实验室,福建福州350002 [2]中国科学院大学,北京100049

出　　处：《中国激光》2022年第23期53-57,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(61875200)。

摘　　要：研究了可常规半导体泵浦的Tm∶YLF激光腔内泵浦Ho∶YVO_(4)激光器。利用c-切Tm∶YLF晶体在1909 nm附近的腔内输出波长以更好地匹配Ho∶YVO_(4)晶体的共振吸收带,实现了最高3.3 W的激光输出,中心波长为2052.7 nm,对应的斜率效率和光光转换效率分别为14.5%和11%。得益于Tm∶YLF晶体固有的弱热透镜效应,该腔内泵浦钬激光器在最高激光功率下仍保持高的光束质量,水平方向和垂直方向的光束质量分别为1.33和1.46。所设计的掺钬钒酸盐激光器经济实用,结构紧凑,且易于实现。Objective The 2.1μm holmium(Ho)laser has important applications in biomedicine,infrared optoelectronic a ntagonism,polymer material processing,and mid-far infrared nonlinear frequency conversion.Compared with mainstream in-band pumped Ho lasers,the intracavity pumped Ho laser can achieve efficient room-temperature Ho laser output based on the compact pump structure of conventional 800 nm laser diode(LD)without additional high-performance 1.9μm thulium-doped(Tm)all-solid-state or fiber laser pump sources.In this Ho laser structure,thulium-doped and Hodoped gain media are placed together in the resonant cavity,and 1.9μm laser is generated in the resonant cavity under the pumping of Tm medium by conventional LD,and the Ho-doped medium is pumped in the same band.Compared with Tm and Ho co-doped lasers with conversion loss,this mechanism has a higher LD-Ho conversion efficiency at room temperature because there is no Tm laser leakage from the cavity during laser operation.In this study,by using Tm∶YLF crystal with negative thermal lens effect to alleviate the combined thermal lens effect of the Ho∶YVO_(4)laser pumped in the cavity,the highest Ho laser output power of 2052 nm is 3.3 W,the slant efficiency is 14.5%,and the LD-Ho laser photoconversion efficienc y is 11%.The acavity-pumped Ho vanadate laser has the highest laser power and laser e fficiency.Methods Polarization absorption spectra of Tm∶YLF crystal sample with Tm atomic fraction of 3%and Ho∶YVO_(4)crystal s ample with Ho atomic fraction of 0.6%are measured using a ultraviolet-vision-near-infrared spectrophotometer.It is u sed to evaluate the spectral overlap between the absorption bands of the Tm∶YLF laser and the Ho∶YVO_(4)crystal in the cavity(Fig.1).The designed intracavity pumped Ho∶YVO_(4)laser adopts a c-cut Tm∶YLF crystal with a size of 3 mm×3 mm×14 mm and an a-cut Ho∶YVO_(4)crystal with a size of 3 mm×3 mm×4 mm(Fig.2).The 2μm laser power is m easured using a pyroelectric power meter.The laser wavelength is measured using a

关 键 词：激光器 掺钬钒酸钇 掺铥氟化钇锂 腔内泵浦 2.1μm 

分 类 号：O437[机械工程—光学工程]