Real-time optical correlator using four-wave mixing in BSO crystal and moving gratings

Baolai Liang; Qinglin Guo; Guangsheng Fu; Zhaoqi Wang

doi:10.1117/12.441541

20 September 2001 Real-time optical correlator using four-wave mixing in BSO crystal and moving gratings

Baolai Liang, Qinglin Guo, Guangsheng Fu, Zhaoqi Wang

Proceedings Volume 4552, Image Matching and Analysis; (2001) https://doi.org/10.1117/12.441541
Event: Multispectral Image Processing and Pattern Recognition, 2001, Wuhan, China

Abstract

Based on the nonlinear property of the moving grating in BSO crystal in four-wave mixing architecture at large fringe modulation, i.e. the enhancement of the reflectivity increases as the incident beam ratio increases and the grating with large pump beam ratio can obtain higher enhancement of the reflectivity, we achieve edge-enhancement and edge-enhanced optical correlation of a binary optical image by applying the moving grating in the Fresnel transform four-wave mixing system. The relative intensity of the edge of the object is enhanced nearly 2 times. The Full- Width-at-Half-Maximum of the auto-correlation peak and the fluctuation noise if obviously suppressed, which indicate that a significant improvement in the discrimination capability of the correlator is achieved.

Citation Download Citation

Baolai Liang, Qinglin Guo, Guangsheng Fu, and Zhaoqi Wang "Real-time optical correlator using four-wave mixing in BSO crystal and moving gratings", Proc. SPIE 4552, Image Matching and Analysis, (20 September 2001); https://doi.org/10.1117/12.441541

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