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The wavefront coding extension of the depth of field (DOE) for an imaging system is achieved by inserting a third order phase plate into the pupil plane of a spatially incoherent imaging system. The encoded image can be digitally restored to produce a final image with improved depth-dependent details. The characteristics of the system are studied, and the modulation transfer function (MTF) varying with defocus and modulation coefficient,, of the third order phase mask is analyzed, the results about the effects of value on the extension of DOE and the bandwidth are obtained. The results are conducible to the design of wavefront coding optical system and the choice of an appropriate velue.
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Keywords:
- wavefront coding /
- field depth extending /
- MTF /
- cubic phase mask
[1] Yun M J, Wan Y, Kong W J, Wang M, Liu J H, Liang W 2008 Acta Phys. Sin. 57 194 (in Chinese) [云茂金、万 勇、孔伟金、王 美、刘均海、梁 伟 2008 57 194]
[2] Pantazis M 2008 Opt. Expr. 16 12995
[3] David G S, Dirk R 2008 Appl. Opt. 47 B64
[4] Dowski E R, Cathey W T 1995 Appl. Opt. 34 1859
[5] Yang Q G, Sun J F, Liu L R 2006 Chin. Phys. Lett. 23 2080
[6] Pan C, Chen J B, Zhang R F, Zhuang S L 2008 Opt. Expr. 16 13364
[7] Zhao T Y, Ye Z, Zhang W Z, Yu F H 2008 Acta Phys. Sin. 57 200 (in Chinese) [赵廷玉、叶 子、张文字、余飞鸿 2008 57 200]
[8] Saeed B, Paulo E X, George B 2009 J. Opt. Soc. Am. 26 895
[9] Somayaji M, Christensen M P 2006 Appl. Opt. 45 2924
[10] Gao Y Q, Zhu B Q, Liu D Z 2009 Chin. Phys.B 18 215
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[1] Yun M J, Wan Y, Kong W J, Wang M, Liu J H, Liang W 2008 Acta Phys. Sin. 57 194 (in Chinese) [云茂金、万 勇、孔伟金、王 美、刘均海、梁 伟 2008 57 194]
[2] Pantazis M 2008 Opt. Expr. 16 12995
[3] David G S, Dirk R 2008 Appl. Opt. 47 B64
[4] Dowski E R, Cathey W T 1995 Appl. Opt. 34 1859
[5] Yang Q G, Sun J F, Liu L R 2006 Chin. Phys. Lett. 23 2080
[6] Pan C, Chen J B, Zhang R F, Zhuang S L 2008 Opt. Expr. 16 13364
[7] Zhao T Y, Ye Z, Zhang W Z, Yu F H 2008 Acta Phys. Sin. 57 200 (in Chinese) [赵廷玉、叶 子、张文字、余飞鸿 2008 57 200]
[8] Saeed B, Paulo E X, George B 2009 J. Opt. Soc. Am. 26 895
[9] Somayaji M, Christensen M P 2006 Appl. Opt. 45 2924
[10] Gao Y Q, Zhu B Q, Liu D Z 2009 Chin. Phys.B 18 215
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