Abstract

Terahertz (THz) digital holography is realized based on a 2.52THz far-IR gas laser and a commercial 124×124 pyroelectric array camera. Off-axis THz holograms are obtained by recording interference patterns between light passing through the sample and the reference wave. A numerical reconstruction process is performed to obtain the field distribution at the object surface. Different targets were imaged to test the system’s imaging capability. Compared with THz focal plane images, the image quality of the reconstructed images are improved a lot. The results show that the system’s imaging resolution can reach at least 0.4mm. The system also has the potential for real-time imaging application. This study confirms that digital holography is a promising technique for real-time, high-resolution THz imaging, which has extensive application prospects.

© 2011 Optical Society of America

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Gerasimov, V. V.

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B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Dem’yanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, in 2010 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz) (IEEE, 2010), pp. 1–3.
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[CrossRef]

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R. J. Mahon, J. A. Murphy, and W. Lanigan, Opt. Commun. 260, 469 (2006).
[CrossRef]

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R. J. Mahon, J. A. Murphy, and W. Lanigan, Opt. Commun. 260, 469 (2006).
[CrossRef]

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B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Dem’yanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, in 2010 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz) (IEEE, 2010), pp. 1–3.
[CrossRef]

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Peters, O.

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B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Dem’yanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, in 2010 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz) (IEEE, 2010), pp. 1–3.
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E. Pickwell and V. P. Wallace, J. Phys. D 39, R301 (2006).
[CrossRef]

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Rodionov, D. G.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Dem’yanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, in 2010 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz) (IEEE, 2010), pp. 1–3.
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Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, Strain 44, 380 (2008).
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Vlasenko, M. G.

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Dem’yanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, in 2010 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz) (IEEE, 2010), pp. 1–3.
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[CrossRef]

Yao, R.

Zhang, C.

N. Karpowicz, H. Zhong, C. Zhang, K-I. Lin, J.-S. Hwang, J. Xu, and X.-C. Zhang, Appl. Phys. Lett. 86, 054105 (2005).
[CrossRef]

Zhang, X.-C.

N. Karpowicz, H. Zhong, C. Zhang, K-I. Lin, J.-S. Hwang, J. Xu, and X.-C. Zhang, Appl. Phys. Lett. 86, 054105 (2005).
[CrossRef]

Zhang, Y.

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, Strain 44, 380 (2008).
[CrossRef]

Zhong, H.

N. Karpowicz, H. Zhong, C. Zhang, K-I. Lin, J.-S. Hwang, J. Xu, and X.-C. Zhang, Appl. Phys. Lett. 86, 054105 (2005).
[CrossRef]

Zhou, W.

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, Strain 44, 380 (2008).
[CrossRef]

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C. Liu, Y. Li, X. Cheng, Z. Liu, F. Bo, and J. Zhu, Opt. Eng. 41, 2434 (2002).
[CrossRef]

Appl. Opt. (1)

Appl. Phys. Lett. (1)

N. Karpowicz, H. Zhong, C. Zhang, K-I. Lin, J.-S. Hwang, J. Xu, and X.-C. Zhang, Appl. Phys. Lett. 86, 054105 (2005).
[CrossRef]

J. Opt. Soc. Am. A (1)

J. Phys. D (1)

E. Pickwell and V. P. Wallace, J. Phys. D 39, R301 (2006).
[CrossRef]

Opt. Commun. (1)

R. J. Mahon, J. A. Murphy, and W. Lanigan, Opt. Commun. 260, 469 (2006).
[CrossRef]

Opt. Eng. (1)

C. Liu, Y. Li, X. Cheng, Z. Liu, F. Bo, and J. Zhu, Opt. Eng. 41, 2434 (2002).
[CrossRef]

Opt. Lett. (2)

Proc. SPIE (1)

V. Kebbel, H. J. Hartmann, W. P. O. Jueptner, Proc. SPIE 4101, 459 (2000).
[CrossRef]

Strain (1)

Y. Zhang, W. Zhou, X. Wang, Y. Cui, and W. Sun, Strain 44, 380 (2008).
[CrossRef]

Other (1)

B. A. Knyazev, A. L. Balandin, V. S. Cherkassky, Y. Y. Choporova, V. V. Gerasimov, M. A. Dem’yanenko, D. G. Esaev, A. A. Nikitin, V. V. Pickalov, M. G. Vlasenko, D. G. Rodionov, and O. A. Shevchenko, in 2010 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz) (IEEE, 2010), pp. 1–3.
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

Experimental setup for off-axis hologram recording.

Fig. 2
Fig. 2

Imaging result of a hollowed-out metal sheet (a) without reference light; (b) hologram; (c) reconstruction result; (d) reconstructed object, cropped from (c).

Fig. 3
Fig. 3

Imaging result of 0.4 mm resolution chart: (a) horizontal strips without reference light, (b) vertical strips without reference light, (c) hologram of horizontal strips, (d) hologram of vertical strips, (e) recovered horizontal strips, (f) recovered vertical strips.

Equations (7)

Equations on this page are rendered with MathJax. Learn more.

O ( x , y ) = O 0 ( x 0 , y 0 ) exp ( j k ρ ) j λ ρ d x 0 d y 0 ,
R ( x , y ) = r exp [ j k ( x sin θ x + y sin θ y ) ] .
t 0 ( x , y ) = | O ( x , y ) | 2 + r 2 ,
t + ( x , y ) = O * ( x , y ) r exp [ j k ( x sin θ x + y sin θ y ) ] ,
t ( x , y ) = O ( x , y ) r exp [ j k ( x sin θ x + y sin θ y ) ] .
U ( x i , y i ) = I ( x , y ) exp ( j k ρ ) j λ ρ d x d y ,
I L ( x , y ) = [ I ( x Δ , y Δ ) + I ( x Δ , y ) + I ( x Δ , y + Δ ) + I ( x , y Δ ) + I ( x , y + Δ ) + I ( x + Δ , y Δ ) + I ( x + Δ , y ) + I ( x + Δ , y + Δ ) 8 I ( x , y ) ] / 8 ,

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