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19 October 2000 Real-time edge-enhanced optical correlation via four-wave mixing in a cerium-doped potassium sodium strontium barium niobate crystal
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Abstract
Degenerate four-wave mixing in a cerium doped potassium sodium strontium barium niobate photorefractive crystal is studied. The transmission grating is dominated in our experimental geometry that the bisector of the pump beam and the signal beam is normal to the c-axis of the crystal. As the fringe modulation depth of this transmission grating varies, the variation of the conjugated beam intensity forms a loop. Based on this nonlinear property, real-time optical image edge-enhancement processing as well as real-time edge- enhanced optical correlation is obtained without the reverse of the signal-to-pump beam intensity ratio. The full-width- at-half-maximum intensity of the auto-correlation peak is one fifth of that without the edge-enhancement operation. The computer simulation results are given, which are coincident with the experimental data very well.
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Zhaoqi Wang, Baolai Liang, Hongli Liu, Jiuhong Guan, and Guoguang Mu "Real-time edge-enhanced optical correlation via four-wave mixing in a cerium-doped potassium sodium strontium barium niobate crystal", Proc. SPIE 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI, (19 October 2000); https://doi.org/10.1117/12.404791
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