Abstract

A method of tomographic imaging is proposed in which two-wave mixing in a photorefractive crystal is used with wavelength scanning of a laser diode and phase modulation of the pump beam. This method provides full optical processing and is effective for weak light from objects because of the use of two-wave mixing. The depth resolution of the method was 1 cm when the wavelength-scanning width was 0.02 nm.

© 2000 Optical Society of America

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References

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1999 (1)

1998 (1)

T. Yoshimura, H. Hiratuka, E. Kido, and K. Yamada, Proc. SPIE 3479, 207 (1998).
[CrossRef]

1997 (2)

Z. He, N. Mukohzaka, and K. Hotate, IEEE Photon. Technol. Lett. 9, 514 (1997).
[CrossRef]

T. Funaba, N. Tanno, and H. Ito, Appl. Opt. 36, 8919 (1997).
[CrossRef]

1995 (2)

1994 (1)

Bonner, R. F.

Fujimoto, J. G.

Funaba, T.

He, Z.

Z. He, N. Mukohzaka, and K. Hotate, IEEE Photon. Technol. Lett. 9, 514 (1997).
[CrossRef]

Hee, M. R.

Hiratuka, H.

T. Yoshimura, H. Hiratuka, E. Kido, and K. Yamada, Proc. SPIE 3479, 207 (1998).
[CrossRef]

Hotate, K.

Z. He, N. Mukohzaka, and K. Hotate, IEEE Photon. Technol. Lett. 9, 514 (1997).
[CrossRef]

Ishii, Y.

Ito, H.

Izatt, J. A.

Kannari, F.

Kido, E.

T. Yoshimura, H. Hiratuka, E. Kido, and K. Yamada, Proc. SPIE 3479, 207 (1998).
[CrossRef]

Mukohzaka, N.

Z. He, N. Mukohzaka, and K. Hotate, IEEE Photon. Technol. Lett. 9, 514 (1997).
[CrossRef]

Onodera, R.

Owen, G. M.

Schmitt, J. M.

Suzuki, K.

Suzuki, M.

Swanston, E. A.

Tanno, N.

Teramura, Y.

Yadlowsky, M. J.

Yamada, K.

T. Yoshimura, H. Hiratuka, E. Kido, and K. Yamada, Proc. SPIE 3479, 207 (1998).
[CrossRef]

Yoshimura, T.

T. Yoshimura, H. Hiratuka, E. Kido, and K. Yamada, Proc. SPIE 3479, 207 (1998).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Setup for tomographic imaging by two-wave mixing with wavelength scanning of the LD and phase modulation of the pump beam. Abbreviations defined in text.

Fig. 2
Fig. 2

Voltage applied to the PZT and injection current of the LD, which generates linear phase-modulation and wavelength scanning, respectively, where p=2.

Fig. 3
Fig. 3

Injection current IH versus intensity ID of the light diffracted from the pump beam for the two objects at L=4 cm and L=6 cm.

Fig. 4
Fig. 4

(a) Images 1 and 2 of the two objects at L=4 cm and L=6 cm. (b)–(e) Images detected with the CCD image sensor at (b) IH=3.0 mA, (c) IH=3.3 mA, (d) IH=3.6 mA, and (e) IH=4.0 mA. Images 2 and 1 appear in the detected images in (b) and (e), respectively.

Equations (5)

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Ict=I0+bt, 0tp/fp,
Lt=L+fpλ0t.
ϕft=2πLt/λ=2πLt/λ0-2πβb/λ02Ltt, 0tp/fp.
ϕft=2πL/λ0+2πfpt-2πβb/λ02Lt, 0tp/fp.
L=λ02fp/βb=pλ02βIH

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