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定量测定光源空间相干性在部分相干光成像, 非相干全息术及光信息处理领域具有重要的研究价值. 本文基于三角全息干涉光路提出了一种测量光源空间相干性的新方法. 利用三角干涉全息光路系统中分束镜产生的孪生光束进行干涉获得干涉图, 通过调整光源中心位置在写入平面内偏离光轴的量, 改变两孪生光束空间分离量的大小, 采集对应的一系列干涉图, 计算干涉图样的对比度, 从而对光源照明空间的波前上一系列不同距离的点对之间的空间复相干度进行测量. 实验系统光路配置较为简单且不需要使用特殊加工的光学元件. 针对一个准单色的扩展光源设计并进行实验, 结果表明利用文中提出的方法可以准确的测量光源的空间相干性, 实验结果相对于理论计算值的误差仅为3.8%.The coherence of light source have been employed in many aspects, such as optical processing and optical coherence holography. For this reason it has attracted vast interest in developing quantitative methods for measuring the spatial coherence characteristics of an optical field. We propose a novel method for measuring the spatial coherence degree of optical fields based on the triangular interferometer. Spatially separated twin beams are formed by an interferometer, and the interferogram formed by the twin beams is captured by an image detector. Because the separation of the twin beams is related to the coordinate position of the input beam, a series of positions are sampled by moving a pinhole and corresponding interference patterns are recorded. Then the visibilities of the interference patterns are calculated for measuring the spatial coherence degree. Experimentally measured and theoretically calculated values of spatial coherence degree fit well. The measurement error is 3.8%. Experimental results show the method proposed here is effective, simple, and robust without any special optical elements.
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Keywords:
- coherence /
- holographic interferometry /
- interferometers /
- optical applications
[1] Zhuang S L, Yu F T S 1982 Appl. Opt. 21 2587
[2] Heylal M, Jeffrey M G 2011 Opt. Lett. 36 900
[3] Winston R, Sun Y, Littlejohn R G 2002 Opt. Commun. 207 41
[4] Agarwal G S, Gbur G, Wolf E 2004 Opt. Lett. 29 459
[5] Ji X L, Xiao X, L B D 2004 Acta Phys. Sin. 53 3996 (in Chinese) [季小玲, 肖希, 吕百达 2004 53 3996]
[6] Ji X L, Huang T X, L B D 2006 Acta Phys. Sin. 55 978 (in Chinese) [季小玲, 黄太星, 吕百达 2006 55 978]
[7] Eyyubbogiu H T 2005 Opt. Commum. 245 37
[8] Takeda M, Wang W, Duan Z H, Miyamoto Y 2005 Opt. Express 13 9629
[9] Naik D N, Ezawa T, Miyamoto Y, Takeda M 2009 Opt. Express 17 10633
[10] Naik D N, Ezawa T, Singh R K, Miyamoto Y, Takeda M 2012 Opt. Express 20 19658
[11] Born M, Wolf E 1999 Principle of Optics (Seventh Edition) (London: Cambridge University Press) p472
[12] Iaconis C, Walmsley I A 1996 Opt. Lett. 21 1783
[13] Santarsiero M, Borghi R 2006 Opt. Lett. 31 861
[14] González A I, Mejía Y 2011 J. Opt. Soc. Am. A 28 1107
[15] Mashaal H, Goldstein A, Feuermann D, Jeffrey M G 2012 Opt. Lett. 37 3516
[16] Cho S, Alonso M A, Brown T G 2012 Opt. Lett. 37 2724
[17] Gray C 1966 J. Opt. Soc. Am. 56 1513
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[1] Zhuang S L, Yu F T S 1982 Appl. Opt. 21 2587
[2] Heylal M, Jeffrey M G 2011 Opt. Lett. 36 900
[3] Winston R, Sun Y, Littlejohn R G 2002 Opt. Commun. 207 41
[4] Agarwal G S, Gbur G, Wolf E 2004 Opt. Lett. 29 459
[5] Ji X L, Xiao X, L B D 2004 Acta Phys. Sin. 53 3996 (in Chinese) [季小玲, 肖希, 吕百达 2004 53 3996]
[6] Ji X L, Huang T X, L B D 2006 Acta Phys. Sin. 55 978 (in Chinese) [季小玲, 黄太星, 吕百达 2006 55 978]
[7] Eyyubbogiu H T 2005 Opt. Commum. 245 37
[8] Takeda M, Wang W, Duan Z H, Miyamoto Y 2005 Opt. Express 13 9629
[9] Naik D N, Ezawa T, Miyamoto Y, Takeda M 2009 Opt. Express 17 10633
[10] Naik D N, Ezawa T, Singh R K, Miyamoto Y, Takeda M 2012 Opt. Express 20 19658
[11] Born M, Wolf E 1999 Principle of Optics (Seventh Edition) (London: Cambridge University Press) p472
[12] Iaconis C, Walmsley I A 1996 Opt. Lett. 21 1783
[13] Santarsiero M, Borghi R 2006 Opt. Lett. 31 861
[14] González A I, Mejía Y 2011 J. Opt. Soc. Am. A 28 1107
[15] Mashaal H, Goldstein A, Feuermann D, Jeffrey M G 2012 Opt. Lett. 37 3516
[16] Cho S, Alonso M A, Brown T G 2012 Opt. Lett. 37 2724
[17] Gray C 1966 J. Opt. Soc. Am. 56 1513
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