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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.
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Keywords:
- partially coherent light /
- Gaussian Schell beam (GSB) /
- lens array /
- concentricity deviation
[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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[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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