Effects of center wavelength and pulse width on superposed energy beams in far field

Shi Huicai; Zhang Rongzhu; Sun Nianchun

doi:10.3788/IRLA201645.0118005

Laser beam far-field superposition is an effective method for improving the far-field target surface energy. Changes of the parameters for unit beam will influence the far-field combined beam. In order to analyze the impact of pulsed laser parameter's control on the far-field energy distribution, the Fraunhofer diffraction integral formula was used and the analytic formula of far field intensity for four beams of ordinary pulsed Gauss beam synthesis was deduced and the specific relationship about laser center wavelength and pulse width change with the far-field stack power were proposed. Through the numerical simulation of MATLAB, the results show, when the center wavelength of beam decreases or pulse width decreases, the far field energy converges to the center axis and the far-field on axis intensity will increase. When the on axis intensity relative to the ideal center wavelength and pulse width in the far field intensity on axis changes rate is less than 5%, the center wavelength maximum rate of change should not exceed 7.89%, or pulse width maximum rate of change should not exceed 91%. Therefore, the center wavelength will have a greater impact on far-field intensity distribution compared with pulse width.

Effects of center wavelength and pulse width on superposed energy beams in far field

1. College of Electronics and Information Engineering,Sichuan University,Chengdu 610064,China

Received Date: 2015-05-11

Rev Recd Date: 2015-06-20

Publish Date: 2016-01-25

Key words:

Abstract: Laser beam far-field superposition is an effective method for improving the far-field target surface energy. Changes of the parameters for unit beam will influence the far-field combined beam. In order to analyze the impact of pulsed laser parameter's control on the far-field energy distribution, the Fraunhofer diffraction integral formula was used and the analytic formula of far field intensity for four beams of ordinary pulsed Gauss beam synthesis was deduced and the specific relationship about laser center wavelength and pulse width change with the far-field stack power were proposed. Through the numerical simulation of MATLAB, the results show, when the center wavelength of beam decreases or pulse width decreases, the far field energy converges to the center axis and the far-field on axis intensity will increase. When the on axis intensity relative to the ideal center wavelength and pulse width in the far field intensity on axis changes rate is less than 5%, the center wavelength maximum rate of change should not exceed 7.89%, or pulse width maximum rate of change should not exceed 91%. Therefore, the center wavelength will have a greater impact on far-field intensity distribution compared with pulse width.

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[1]	Wang Mingzhe, Ma Wen, Zhang Yongliang, et al. Thermal fracture and pump limit of Nd:glass[J]. High Power Laser and Partical Beam, 2011, 23(5): 1167-1172. (in Chinese) 王明哲, 马文, 张永亮, 等。钕玻璃的热致断裂及泵浦极限[J]. 强激光与粒子束, 2011, 23(5): 1167-1172.
[2]	Zhang Baoan, Chen Heming, Zhu Jianqiang. Quality control in large-aperture laser glass Optical processing[J]. Journal of Applied Optics, 2009, 30(1): 96-100. (in Chinese) 张宝安, 陈鹤明, 朱健强。大口径激光玻璃光学加工的质量控制[J]. 应用光学, 2009, 30(1): 96-100.
[3]	Dong Fenli. The research on thermal effect of LD pumped rod and thin-disk laser crystal[D]. Harbin: Harbin Institute of Technology, 2008. (in Chinese) 董粉丽。LD泵浦的棒状和薄片状激光介质热效应研究[D]. 哈尔滨: 哈尔滨工业大学, 2008.
[4]	Cao Dingxiang. Study on thermal effects thermal management in high power solid state lasers[D]. Changsha: National University of Defense Technology, 2008. (in Chinese) 曹丁象。高功率固体激光系统的热效应及热管理研究[D]. 长沙: 国防科学技术大学, 2008.
[5]	Wang Hui. Influence of the thermal effect on the output performance of diode pumped solid state laser[D]. Xi'an: Xidian Unsiversity, 2010. (in Chinese) 王慧。热效应对二极管泵浦激光器输出性能的影响[D]. 西安: 西安电子科技大学, 2010.
[6]	Tao Yujia. Study on the cooling of high-power solid-State lasers[D]. Beijing: Graduate School of Chinese Academy of Sciences(Institute of Thermophysics), 2010. (in Chinese) 陶毓伽。大功率固体激光器冷却研究[D]. 北京: 中国科学院研究生院(工程热物理研究所), 2010.
[7]	Xu Honghao. Growth and characterization of Neodyminum Doped LaxRn1-xVO4 Series Mixed Crystals[D]. Ji'nan: Shandong Unsiversity, 2014. (in Chinese) 徐洪浩。钕掺杂含镧钒酸盐晶体的生长和性质表征[D]. 济南: 山东大学, 2014.
[8]	Su Rongtao, Wang Xiaolin, Zhou Pu, et al. Resent research and development of beam combination of high power pulse fiber laser[J]. Laser Optoelectronics Progress, 2011, 48: 101401. (in Chinese) 粟荣涛, 王小林, 周朴, 等。高功率脉冲光纤激光光束合成的最新研究进展[J]. 激光与光电子学进展, 2011, 48: 101401.
[9]	Liu Zejin, Zhou Pu, Tao Rumao, et al. Analysis of beam combination technology of high-power LD pumped laser array[J]. Acta Optica Sinica, 2011(9): 109-118. (in Chinese) 刘泽金, 周朴, 陶汝茂, 等。高能固态激光阵列光束合成技术浅析[J]. 光学学报, 2011(9): 109-118.
[10]	Li Hongyan, Ren Xiangjun. Research and application of light beam combination[J]. Laser Optoelectronics Progress, 2002, 39(7): 22-25. (in Chinese) 李红艳, 任向军。光束合成技术研究及其应用[J]. 激光与光电子学进展, 2002, 39(7): 22-25.
[11]	Sun Ling, Zhao Hong, Yang Wenshi, et al. Study on coherent combination theory of multibeam laser[J]. Laser Infrared, 2007, 37(2): 111-113. (in Chinese) 孙玲,赵鸿,杨文是, 等。多光束激光相干合成技术研究[J]. 激光与红外, 2007, 37(2): 111-113.
[12]	Wang Long, Shen Xueju, Zhang Weian, et al. [J].Laser Technology, 2012(5): 700-703. (in Chinese) 王龙, 沈学举, 张维安, 等。高斯光束的光谱传输特性分析[J]. 激光技术, 2012(5): 700-703.

Effects of center wavelength and pulse width on superposed energy beams in far field

doi: 10.3788/IRLA201645.0118005

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