Abstract

We demonstrate a compact optical correlator using a diffractive optical element (DOE) beam splitter for 2D optical image processing. Image frequency conversion and correlation are demonstrated using third-harmonic generation (THG) in an organic film with a 1550nm femtosecond laser. Spatial and temporal alignment of the femtosecond pulses are obtained by imaging the DOE onto the organic film.

© 2007 Optical Society of America

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References

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2006 (1)

2004 (2)

G. Ramos-Ortiz, M. Cha, S. Thayumanavan, J. C. Mendez, S. R. Marder, and B. Kippelen, Appl. Phys. Lett. 82, 179 (2004).
[CrossRef]

G. Ramos-Ortiz, M. Cha, B. Kippelen, G. A. Walker, S. Barlow, and S. R. Marder, Opt. Lett. 29, 2515 (2004).
[CrossRef] [PubMed]

2003 (1)

1998 (3)

1994 (1)

C. Halvorson, A. Hays, B. Kraabel, R. Wu, F. Wudl, and A. J. Heeger, Science 265, 1215 (1994).
[CrossRef] [PubMed]

1993 (1)

1980 (1)

Appl. Opt. (1)

Appl. Phys. Lett. (1)

G. Ramos-Ortiz, M. Cha, S. Thayumanavan, J. C. Mendez, S. R. Marder, and B. Kippelen, Appl. Phys. Lett. 82, 179 (2004).
[CrossRef]

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

Opt. Express (2)

Opt. Lett. (4)

Science (1)

C. Halvorson, A. Hays, B. Kraabel, R. Wu, F. Wudl, and A. J. Heeger, Science 265, 1215 (1994).
[CrossRef] [PubMed]

Other (3)

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, 1996).

G. Ramos-Ortiz, Ph.D. dissertation (University of Arizona, 2003).

G. Ramos-Ortiz, M. Cha, G. Walker, S. R. Marder, and B. Kippelen, in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper CTuZ7.
[PubMed]

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Figures (4)

Fig. 1
Fig. 1

Schematic of the compact optical correlator using a DOE beam splitter. The DOE is a 2D phase grating with 40 μ m periods in both directions. Images for processing are inserted into the beam paths of the three ( ± 1 , ± 1 ) order beams picked by the beam block. The inset shows the ten generated THG beams captured by an Si CCD camera. The center THG beam, k 1 + k 2 + k 3 , is used for correlation.

Fig. 2
Fig. 2

Frequency converted letters taken at the image plane with an Si CCD camera. Using points to simulate the delta function in beams 1 and 3, images were encoded in beam 2 at frequency ω and frequency converted to 3 ω using THG in an organic film. Better resolution was obtained when the points better approximated the delta function. Diameter of the points: (a) 1.0 mm , (b) 0.5 mm .

Fig. 3
Fig. 3

Frequency converted images of an aircraft using 0.5 mm diameter points in beams 1 and 3.

Fig. 4
Fig. 4

Inverted target image (a) in beam 1 and input images (b) in beam 2 used for the correlation experiment. The corresponding correlation results are shown in (c). ⊗ denotes convolution.

Equations (1)

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A THG ( r ) A 1 ( r ) A 2 ( r ) A 3 ( r ) ,

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