Real-time joint transform correlator using phase conjugation in photorefractive crystal

Subhash C. Jain; Mahendra Singh; K. S. Bist

doi:10.1117/12.303658

18 March 1998 Real-time joint transform correlator using phase conjugation in photorefractive crystal

Subhash C. Jain, Mahendra Singh, K. S. Bist

Proceedings Volume 3293, Practical Holography XII; (1998) https://doi.org/10.1117/12.303658
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

Abstract

This paper presents a technique for realizing the Joint Transform Correlator in real time using a Barium Titanate crystal and a low power He-Ne laser. This technique avoids the use of additional CCD camera and electrically addressed SLM, and provide high fidelity correlation peak. The phenomenon of Degenerate Four Wave Mixing is used for image correlation in this experiment. The object and reference are arranged in a single beam and the Joint Fourier Transform is focused in the crystal. Fourier Transform of the conjugate beam gives the required correlation. The peaks are recorded with the help of low light sensitive CCD camera for further analysis for determining the exact location of the target.

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Subhash C. Jain, Mahendra Singh, and K. S. Bist "Real-time joint transform correlator using phase conjugation in photorefractive crystal", Proc. SPIE 3293, Practical Holography XII, (18 March 1998); https://doi.org/10.1117/12.303658

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KEYWORDS

Fourier transforms

Crystals

Optical correlators

Joint transforms

CCD cameras

Ferroelectric materials

Laser crystals

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