796 nm二极管泵浦连续波1.88 W Tm∶LYF激光器  

796 nm Diode-pumped 1.88 W Continuous-wave Tm∶LYF Laser

作　　者：丁本利 周雄[1] 夏海平[1] 张百涛 陈宝玖[3] DING Ben-li;ZHOU Xiong;XIA Hai-ping;ZHANG Bai-tao;CHEN Bao-jiu(Key Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China;State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, China;Department of Physics, Dalian Maritime University, Dalian 116026, China)

机构地区：[1]宁波大学光电子材料重点实验室,浙江宁波315211 [2]山东大学晶体材料研究所晶体材料国家重点实验室,山东济南250100 [3]大连海事大学物理系,辽宁大连116026

出　　处：《发光学报》2020年第7期819-825,共7页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51772159);浙江省自然科学基金(LZ17E020001)资助项目。

摘　　要：用坩埚下降法生长了Tm3+掺杂浓度分别为0.8%和1.3%的优质大尺寸LiYF4(LYF)单晶体。测定了单晶体的吸收光谱、发射光谱,并计算了3F4能级的的最大吸收截面与最大发射截面分别为0.25×10^-20 cm^2和0.33×10^-20 cm^2。以796 nm半导体激光器(LD)为泵浦源,采用短平板腔结构模型研究了Tm掺杂LYF单晶体在~2.0μm波段的激光输出性能。当LD泵浦功率为3.4 W时,Tm∶YLF晶体的最大激光输出功率为1.88 W,相应的光光转换效率和斜率效率分别为51%和57%。使用半导体可饱和吸收镜抽运Tm掺杂LYF单晶体,测试其在~2.0μm波段连续波锁模激光运转。当最大抽运功率为3.5 W时,获得锁模激光的最大平均输出功率为200 mW,此时锁模脉冲宽度~20 ps,对应的重复频率63.86 MHz,中心谱线为1.88μm。结果表明,Tm掺杂LYF单晶体是一种具有较好物理性能的~2μm波段超快激光晶体。High quality LiYF4(LYF)single crystals in big size doped with Tm3+in 0.8%and 1.3%concentrations were grown by Bridgman method.The absorption spectra and emission spectra were measured.The maximum absorption cross section and maximum emission cross section of 3F4 level were calculated to be 0.25×10^-20 cm^2 and 0.33×10^-20 cm^2,respectively.The laser output of Tm3+doped LYF crystals in the^2.0μm band was carried out by using short flat-flat cavity taking 796 nm semiconductor laser as pumping source.A maximum CW output of 1.88 W at an absorbed pump power of 3.4 W was achieved from the Tm3+doped LYF single crystal,and the corresponding conversion efficiency and slope efficiency for the laser output were 51%and 57%,respectively.A Tm-doped LYF single crystal was pumped using a semiconductor saturable absorption mirror,and its operation in a^2.0μm band CW laser was tested.When the maximum pump power is 3.5 W,the maximum average output power of the mode-locked laser is 200 mW.At this time,the mode-locked pulse width is about 20 ps,the corresponding repetition frequency is 63.86 MHz,and the center line is 1.88μm.The results show that the Tm-doped LYF single crystal is a^2μm band ultrafast laser crystal with good physical properties.

关 键 词：Tm离子 2.0μm 连续波 连续波锁模 

分 类 号：O734[理学—晶体学] O782