利用部分相干光和同心角偏差透镜列阵实现二维靶面均匀辐照

郑建洲; 于清旭; 关寿华; 董斌; 曹晓君; 芦永军; 吴云峰

doi:10.7498/aps.61.154205

摘要

提出利用部分相干光通过透镜列阵系统实现靶而的均匀辐照, 透镜列阵能获得边缘陡峭且顶部较平坦的准近场焦斑, 透镜列阵的适当同心度偏差又使各子束的斑纹相互稍微错开, 使干涉斑纹变密, 而入射的激光是空间相干性减少了的部分相干光, 可进一步抑制了透镜列阵系统焦斑的小尺度不均匀性. 使用广义衍射积分理论, 对高斯-谢尔光束通过透镜列阵光学系统的焦斑光强分布进行了详细的二维模拟研究, 比较了完全相干光与部分相干光经过透镜列阵的匀滑效果. 数值模拟表明, 应用同心度偏差和适当离焦时, 可实现焦斑均匀性和能量利用率同时达到最佳的效果.

关键词:

Abstract

A method of employing a lens array (LA) and partially coherent light (PCL) is presented for uniform irradiation on targets in inertial confinement fusion. Quasi-near field spots with a profile of sharp edge and flat top can be obtained with an LA, while the spatial coherence of the incidence beam is reduced by PCL. An appropriate concentricity deviation (CD) of LA results in the superposition of beamlets at the focus dislocated by a small amount each other and the CD and PCL reduce the fringe separations, thus the interference fringes become denser and the small-scale intensity non-uniformity of intensity distribution is suppressed. Based on the generalized diffraction integral theory, the intensity distribution of a Gaussian Schell Beam (GSB), point focused by an LA and a spherical lens is investigated in detail by two-dimensional simulation. And irradiation uniformity effects are compared with coherent light and partially coherent light after the LA. Numerical results indicate that using an appropriate CD and moving the target slightly from the exact focal plane of the principal focusing, a well-irradiated laser spot and great energy efficiency can be obtained.

Keywords:

作者及机构信息

1.
大连民族学院物理与材料工程学院, 大连 116600;

2.
大连理工大学应用物理与光电技术学院, 大连 116024

基金项目: 国家自然科学基金(批准号: 30470416), 国家民委科研项目(批准号: 10DL07), 中央高校基本科研业务费专项资金(批准号: DC12010221)和大连民族学院博士启动基金资助的课题.

Authors and contacts

1.
College of Physics and material Engineering, Dalian Nationalities University, Dalian 116600, China;

2.
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 30470416), the Scientific Research Project of State Ethnic affairs Commission of the People's Republic of China (Grant No. 10DL07), the Fundamental Research Funds for the Central Universities (Grant No. DC12010221), and the Dalian Nationalities University Doctoral Sustentation Fund.

参考文献

[1]	Xiao J, Lü B D, Jiang M 2000 Acta Phys. Sin. 47 1998 (in Chinese) 49 2383 [肖峻, 吕百达, 姜明 2000 物理学报 49 2383]
[2]	Jiang X J, Lin Z Q 2010 Laser & Optoelectronics Progress 47 22 (in Chinese) [江秀娟, 林尊琪 2010 激光与光电子学进展 47 22]
[3]	Deng X M, Liang X C, Cheng Z Z, Yu W Y, Ma R Y 1986 Appl. Opt. 25 377
[4]	Villeueuve D M, Enright G D, Baldis H A 1991 Opt. Commun. 81 54
[5]	XiaoJ, Lü B D, Jiang M 1999 Acta Phys. Sin. 48 1891 (in Chinese) 48 1891 (in Chinese) [肖峻, 吕百达, 姜明 1999 物理学报 48 1891]
[6]	Lehmberg R H, Schmitt A J, Bodner S E 1987 J. Appl. Phys. 62 2680
[7]	Zhou S L, Lin Z Q, Jiang X J 2007 Appl. Opt. 46 3164
[8]	Nakano H, Miyanaga N, Yagi K, Tsubakimoto K, Kanabe T, Nakatsuka M, Nakai S 1993 Appl. Phys. Lett. 63 580
[9]	Jiang X J, Zhou S L, Lin Z Q, Zhu J 2006 Acta Phys. Sin. 55 2571 (in Chinese) [江秀娟, 周申蕾, 林尊琪, 朱俭 2006 物理学报 55 5824]
[10]	Zhang B, Lü B D, Xiao J 1998 Acta Phys. Sin. 47 1998 (in Chinese) [张彬, 吕百达, 肖峻 1998 物理学报 47 1998]
[11]	Wolf E, Collett E 1978 Opt. Commun. 25 293
[12]	Foley J T, Zubairy M S 1978 Opt. Commun. 26 297
[13]	Gase R J 1991 Mod. Opt. 38 1107
[14]	Cheng Z Z, Liang X C, Deng X M 1989 Chinens Journal of Laser 13 65 (in Chinese) [陈泽尊, 梁向春, 邓锡铭 1986 中国激光 13 65]
[15]	Zheng J Z, Yu Q X, Lu Y J 2007 Chinens Journal of Laser 34 331 (in Chinese) [郑建洲, 于清旭, 卢永军 2007 中国激光 34 331]

施引文献

[1]	Xiao J, Lü B D, Jiang M 2000 Acta Phys. Sin. 47 1998 (in Chinese) 49 2383 [肖峻, 吕百达, 姜明 2000 物理学报 49 2383]
[2]	Jiang X J, Lin Z Q 2010 Laser & Optoelectronics Progress 47 22 (in Chinese) [江秀娟, 林尊琪 2010 激光与光电子学进展 47 22]
[3]	Deng X M, Liang X C, Cheng Z Z, Yu W Y, Ma R Y 1986 Appl. Opt. 25 377
[4]	Villeueuve D M, Enright G D, Baldis H A 1991 Opt. Commun. 81 54
[5]	XiaoJ, Lü B D, Jiang M 1999 Acta Phys. Sin. 48 1891 (in Chinese) 48 1891 (in Chinese) [肖峻, 吕百达, 姜明 1999 物理学报 48 1891]
[6]	Lehmberg R H, Schmitt A J, Bodner S E 1987 J. Appl. Phys. 62 2680
[7]	Zhou S L, Lin Z Q, Jiang X J 2007 Appl. Opt. 46 3164
[8]	Nakano H, Miyanaga N, Yagi K, Tsubakimoto K, Kanabe T, Nakatsuka M, Nakai S 1993 Appl. Phys. Lett. 63 580
[9]	Jiang X J, Zhou S L, Lin Z Q, Zhu J 2006 Acta Phys. Sin. 55 2571 (in Chinese) [江秀娟, 周申蕾, 林尊琪, 朱俭 2006 物理学报 55 5824]
[10]	Zhang B, Lü B D, Xiao J 1998 Acta Phys. Sin. 47 1998 (in Chinese) [张彬, 吕百达, 肖峻 1998 物理学报 47 1998]
[11]	Wolf E, Collett E 1978 Opt. Commun. 25 293
[12]	Foley J T, Zubairy M S 1978 Opt. Commun. 26 297
[13]	Gase R J 1991 Mod. Opt. 38 1107
[14]	Cheng Z Z, Liang X C, Deng X M 1989 Chinens Journal of Laser 13 65 (in Chinese) [陈泽尊, 梁向春, 邓锡铭 1986 中国激光 13 65]
[15]	Zheng J Z, Yu Q X, Lu Y J 2007 Chinens Journal of Laser 34 331 (in Chinese) [郑建洲, 于清旭, 卢永军 2007 中国激光 34 331]

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