双管级联薄管激光放大器环域像差自补偿方法  

Method for Self-Correction of Annular Off-Axis Aberrations in Two-Stage Tube Laser Amplifiers

作　　者：李佳 田博宇 余江川 张彬[1] Li Jia;Tian Boyu;Yu Jiangchuan;Zhang Bin(College of Electronics and Information Engineering,Sichuan University,Chengdu,Sichuan 610064,China)

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《中国激光》2021年第13期61-71,共11页Chinese Journal of Lasers

基　　金：四川省科技计划资助项目(2018JY0553);中国科学院自适应光学重点实验室基金(LAOF1801)。

摘　　要：针对高功率双管级联薄管激光放大器的环域像差补偿需求,提出了一种环域像差自补偿方法。该方法通过一个直角锥镜使非理想薄管激光光路折转,利用往返光路共轭的特性实现畸变波前的自补偿。通过数值模拟仿真,验证了双管结构中单个薄管引入加工误差及光源对准误差时该自补偿方法的校正能力,并详细分析了该方法对双管配合误差的自补偿效果。在此基础上,进一步考虑了直角锥镜误差对双管级联结构波前环域像差补偿效果的影响。结果表明,该自补偿方法能有效抑制双管级联薄管激光放大器中由加工误差和装调误差所引入的环域离轴像差,且对直角锥镜装调误差容限较大,有利于提升薄管激光器的抗失调稳定性。Objective Solid-state lasers have attracted extensive attention because of their advantages of high efficiency and high beam quality. Solid-state tube lasers with zigzag beam paths(SSZTLs) combine the outstanding characteristics of rod and slab lasers, such as compact structure and light weight, and overcome the shortcoming of insufficient thermal load capacity, providing a potential approach to realize high-power lasers. These advantageous characteristics have resulted in some attractive applications in the fields of military defense and industrial manufacturing. However, the beam quality of SSZTLs is extremely sensitive to alignment and fabrication errors of the gain medium owing to their unique tubular structure. To improve the beam quality of SSZTLs, we propose a novel self-correction method to eliminate annular off-axis aberrations of the laser beam in SSZTLs.Methods Taking neodymium-doped yttrium aluminum garnet(Nd∶YAG)two-stage tube laser amplifiers as an example,a novel beam-correction method based on a right-angled conical reflector was proposed for the selfcorrection of annular off-axis aberrations in high-power two-stage thin-walled tube laser amplifiers.A right-angled conical reflector makes the laser beam propagate through two conjugate beam paths successively,which compensates the off-axis aberrations.First,based on a numerical simulation,the validity of this method to correct fabrication and alignment errors of a single tube was verified.Then,the correction effect of this method on matching errors of twostage tubes was further analyzed.Finally,the influence of the structural parameters of the right-angled conical reflector on the aberration correction effect was discussed and the wavefront aberration caused by alignment and fabrication errors of the right-angled conical reflector was quantitatively analyzed using the annular Zernike polynomial decomposition theory.Results and Discussions The proposed self-correction method can effectively correct alignment and fabrication errors induced by a sing

关 键 词：激光器 双管级联薄管激光放大器 直角锥镜 自补偿 环域像差 

分 类 号：TN248[电子电信—物理电子学] O436[机械工程—光学工程]