-
摘要:采用二维线性调频 z变换算法，分析了影响高能 系统光束质量 β因子测量准确性的因素。本文详细分析了采样点数（即衍射极限内的采样点数）和衍射光斑图像的能量损失率对光束质量 β因子的影响。在衍射极限角直径2 ( λ/ D)范围内不同采样点数的模拟结果表明：采样点数越高，光斑衍射图像的分辨率越高，进而光束质量 β因子计算越准确。在一倍衍射极限角2.44 ( λ/ D)范围内应最低不少于10个采样点，即可将 β因子的测量误差控制在3%。同时，不同像差对光斑图像能量损失率的敏感程度不同，相同能量损失率下，高阶像差的 β因子测量误差要高于低阶像差。特别是球差类的像差对能量损失最为敏感, 约5%的能量损失就可带来15%~30%的 β因子计算误差。Abstract:The influencing factors of beam quality βfactor of high-energy laser system is analyzed based on two-dimension chirp ztransformation. The effects of the sampling number within the diffraction limit and the beam spot’s energy loss on the beam quality βfactor are analyzed. The simulation results based on different sampling numbers indicate that a larger sampling number induces higher beam spot diffraction image resolution which is beneficial for more accurate calculation of a beam quality βfactor. When the sampling number of the diffraction limit angle is no less than ten, the measurement error can be limited within 3%. Meanwhile, different wavefront aberrations have different sensitivities against beam spot energy loss. The beam quality βfactor of high order wavefront aberration is larger than that of low order aberration with equal energy loss. Especially, the spherical aberration is most sensitive to energy loss, and about 5% energy loss can induce 15% to 30% calculation error of the βfactor.
-
Key words:
- chirpztransformation/
- beam quality/
- βfactor/
- sampling number/
- energy loss
-
图 1基于不同采样点数的衍射光斑图像
Figure 1.The obtained diffraction beam figures based on different sampling numbers
图 2理想光束质量β因子随采样点数的变化规律
Figure 2.Beam qualityβfactor varies with sampling number of the ideal beam
图 3球差类像差对应的光束质量β因子随采样点数的变化规律
Figure 3.Variations of beam qualityβwith sampling number corresponding to the spherical, second-spherical and third-spherical wavefront aberrations
图 4球差像差A11对应的桶中功率（PIB）随采样点数的变化
Figure 4.Variations of power in bucket (PIB) with sampling number for the spherical wavefront aberration
图 5几种典型像差类型的PIB曲线和光束质量β因子值
Figure 5.PIB curves and beam qualityβof several typical wavefront aberrations
图 6（a）离焦、（b）像散、（c）彗差和（d）初级球差对应的光束质量β因子测量误差与能量损失比的关系曲线
Figure 6.Relationship of measurement error curves ofβfactor with different energy losses corresponding to (a) the power, (b) the astigmatism, (c) the coma and (d) the spherical aberrations respectively
-
[1] 苏毅, 万敏. 高能 系统[M]. 北京: 国防工业出版社, 2004: 1-9.SU Y, WAN M.High Energy Laser System[M]. Beijing: National Defense Industry Press, 2004: 1-9. (in Chinese) [2] 吕百达, 康小平. 对 光束质量一些问题的认识[J]. 红外与 工程,2007,36(1):47-51.doi:10.3969/j.issn.1007-2276.2007.01.012LÜ B D, KANG X P. Some aspects of laser beam quality[J].Infrared and Laser Engineering, 2007, 36(1): 47-51. (in Chinese)doi:10.3969/j.issn.1007-2276.2007.01.012 [3] 田英华, 叶一东, 向汝建, 等. 光束质量因子测量的不确定度分析[J]. 强 与粒子束,2008,20(7):1076-1078.TIAN Y H, YE Y D, XIANG R J,et al. Evaluation of uncertainty in beam quality measurement[J].High Power Laser and Particle Beams, 2008, 20(7): 1076-1078. (in Chinese) [4] 闫宏宇, 高欣, 宋健, 等. 976 nm宽条形高功率半导体 器的光束质量M2评价[J]. 发光学报,2019,40(2):196-203.doi:10.3788/fgxb20194002.0196YAN H Y, GAO X, SONG J,et al. Evaluation of beam qualityM2for 976 nm wide stripe high power semiconductor laser[J].Chinese Journal of Luminescence, 2019, 40(2): 196-203. (in Chinese)doi:10.3788/fgxb20194002.0196 [5] 陈诚, 郑加金, 韦玮, 等. 基于CCD测量 光束质量M2[J]. 发光学报,2017,38(5):643-648.CHEN CH, ZHENG J J, WEI W,et al. Measurement of laser beam qualityM2based on CCD[J].Chinese Journal of Luminescence, 2017, 38(5): 643-648. (in Chinese) [6] 许坤, 付林杰, 钟发成, 等. 高光束质量垂直腔面发射 器同相耦合阵列[J]. 发光学报,2018,39(6):844-849.doi:10.3788/fgxb20183906.0844XU K, FU L J, ZHONG F CH,et al. High beam quality in-phase coupled vertical cavity surface emitting laser array[J].Chinese Journal of Luminescence, 2018, 39(6): 844-849. (in Chinese)doi:10.3788/fgxb20183906.0844 [7] 张震, 周孟莲, 张检民, 等. CCD中的 光斑阴影现象及机理[J]. 光学 精密工程,2013,21(5):1365-1371.doi:10.3788/OPE.20132105.1365ZHANG ZH, ZHOU M L, ZHANG J M,et al. Shadows of laser spots in CCD and their mechanism[J].Optics and Precision Engineering, 2013, 21(5): 1365-1371. (in Chinese)doi:10.3788/OPE.20132105.1365 [8] 熊刚, 丁天怀, 王鹏. 应用属性距离加权平均滤波提高CCD光斑的亚像素定位精度[J]. 光学 精密工程,2012,20(5):1102-1109.doi:10.3788/OPE.20122005.1102XIONG G, DING T H, WANG P. Improvement of sub-pixei location accuracy of light-spot on CCD with ADWA filter[J].Optics and Precision Engineering, 2012, 20(5): 1102-1109. (in Chinese)doi:10.3788/OPE.20122005.1102 [9] 宋建中, 韩广良, 顾海军. 提高外场脉冲 光斑测量距离的有效方法[J]. 光学 精密工程,2002,10(3):300-303.SONG J ZH, HAN G L, GU H J. Effective methods for raising the measured distance of the pulse laser spots removed target in outfield[J].Optics and Precision Engineering, 2002, 10(3): 300-303. (in Chinese) [10] 杨鹏翎, 冯国斌, 王群书, 等. 中红外高能 光斑探测器[J]. 中国 ,2009,36(8):1979-1985.doi:10.3788/CJL20093608.1979YANG P L, FENG G B, WANG Q SH,et al. Min-infrared high energy laser beam sensor[J].Chinese Journal of Lasers, 2009, 36(8): 1979-1985. (in Chinese)doi:10.3788/CJL20093608.1979 [11] 李晓艳, 张磊, 张红刚, 等. 基于双CCD探测的外场高精度 光斑测试技术[J]. 红外与 工程,2015,44(1):59-64.doi:10.3969/j.issn.1007-2276.2015.01.010LI X Y, ZHANG L, ZHANG H G,et al. Technology of high precision test for laser spot based on double CCD detection in the outfield[J].Infrared and Laser Engineering, 2015, 44(1): 59-64. (in Chinese)doi:10.3969/j.issn.1007-2276.2015.01.010 [12] 陈少杰, 张亮, 王建宇. 探测器条状噪声对精跟踪系统光斑定位的影响[J]. 中国 ,2017,44(9):0906008.doi:10.3788/CJL201744.0906008CHEN SH J, ZHANG L, WANG J Y. Effect of stripe noise of detector on light spot location of fine tracking system[J].Chinese Journal of Lasers, 2017, 44(9): 0906008. (in Chinese)doi:10.3788/CJL201744.0906008 [13] 贺元兴, 李新阳. 阈值法对 远场焦斑质量测量和计算的影响[J]. 中国 ,2012,39(12):1208001.doi:10.3788/CJL201239.1208001HE Y X, LI X Y. Influence of threshold method on calculation results of far-field spot quality[J].Chinese Journal of Lasers, 2012, 39(12): 1208001. (in Chinese)doi:10.3788/CJL201239.1208001 [14] 刘志强, 宋庆和, 刘超, 等. 基于虚拟光波场的菲涅耳衍射计算及应用研究[J]. 应用光学,2018,39(2):196-199.LIU ZH Q, SONG Q H, LIU CH,et al. Fresnel diffraction calculation with virtual light wave field and its application[J].Journal of Applied Optics, 2018, 39(2): 196-199. (in Chinese) [15] 王艳茹, 冉铮惠, 丁宇洁. 二维线性调频z变换用于光束质量β因子计算[J]. 中国光学,2020,13(5):965-974.doi:10.37188/CO.2020-0079WANG Y R, RAN ZH H, DING Y J. Beam qualityβfactor calculation based on two-dimensional chirpztransformation[J].Chinese Optics, 2020, 13(5): 965-974. (in Chinese)doi:10.37188/CO.2020-0079 -
下载:
点击查看大图
图(7)
计量
- 文章访问数:1629
- HTML全文浏览量:407
- PDF下载量:163
- 被引次数:0
