885nm双端泵准连续微秒脉冲1319nm三镜环形腔激光  

A quasi-continuous dual-end 885 nm diode-pumped three-mirror ring-cavity laser operating at 1319 nm

作　　者：谢仕永[1,2] 张小富[1] 乐小云[1] 杨程亮[2] 薄勇[3] 王鹏远[4] 许祖彦[3] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院,北京100191 [2]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,长春130033 [3]中国科学院理化技术研究所,激光物理与技术研究中心,北京100190 [4]中国科学院大连化学物理研究所,化学激光重点实验室,大连116023

出　　处：《物理学报》2016年第15期104-110,共7页Acta Physica Sinica

基　　金：应用光学国家重点实验室开放基金;国家自然科学基金(批准号:61205101);深圳市科技计划项目(批准号:GJHZ20140417113430592,JCYJ20140417113130693,JCYJ20150925163313898)资助的课题~~

摘　　要：采用885 nm半导体激光双端泵Nd:YAG三镜环形腔获取高功率、高光束质量、可调谐的准连续微秒脉冲1319 nm激光,通过腔镜镀膜和腔内插入标准具,分别抑制Nd:YAG的1064 nm与1338 nm谱线起振.薄膜偏振片用作环形腔的输出镜,与半波片配合实现输出耦合率连续可调.885 nm抽运功率150 W时,在热近非稳腔运转条件下获得重复频率800 Hz脉冲宽度150μs、平均功率22.5 W的1319 nm偏振激光输出,光束质量因子M_x^2=1.35,M_y^2=1.24.腔内插入1319 nm的倍频晶体KTiOPO_4。通过二次谐波效应使高强度的尖峰脉冲序列减弱,实现激光脉冲弛豫振荡的有效抑制.精确控制标准具温度,实现激光波长从1318.888 nm精细调谐到1319.358 nm,调谐范围为470 pm(81 GHz),相应的调谐精度为0.7 pm(125 MHz).The 1319 nm lasers have important applications in the fields of optical fiber communication,laser medical treatment and laser color display.The Nd：YAG laser pumped by 808 nm laser diode is an efficient alternative to achieving 1319 nm laser output.In recent years,direct pump technology using 885 nm laser diodes has become more promising due to the dramatically reduced thermal effect and improved optical conversion efficiency.Quasi-continuous sodium beacon laser with microsecond pulse duration generated by the sum-frequency of 1319 nm and 1064 nm lasers can provide a gatable pulse format to eliminate the interference of atmospheric Rayleigh scattering and mitigate the spot elongation of sodium guide star to improve imaging accuracy.However,relaxation oscillation in the microsecond pulse could cause the damage to the nonlinear crystal and reduce the efficiency of sum-frequency generation.It is effective to suppress the relaxation by taking advantage of second harmonic generation,in which a nonlinear crystal is utilized to reduce the pulse peaks with higher intensity.In this paper,we demonstrate a high-power relaxation-oscillation-free quasi-continuous microsecond pulse 1319 nm laser by using the dual-end 885 nmdiode-pumped three-mirror ring-cavity.Intra-cavity etalon and customized mirror coating are employed to prevent the 1064 nm and 1338 nmline of Nd：YAG laser crystal from oscillating.A power tuning device,including a thin-film polarizer and a halfwave plate is implemented as the output mirror of ring cavity,which enables continuous adjustment of the out coupling ratio.The output power of the 1319 nm polarized laser is 22.5 W pumped by 150 W 885 nm laser diode.The repetition rate is 800 Hz and pulse width is 150 μs.The corresponding optical conversion efficiency is 15%.The beam quality factor M-2 is measured to be Mx^2 = 1.35 and My^2 = 1.24.By precisely adjusting the temperature of etalon viz.adjusting refractive index as well as thickness of the etalon material,laser wavelength is tuned from 1318.888 nm t

关 键 词：885 nm双端泵 环形腔 弛豫振荡 波长调谐 

分 类 号：TN24[电子电信—物理电子学]