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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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