Scientists at the University of Southern California (Los Angeles, CA) used a thin glass cell filled with cesium vapor as the nonlinear material in a holographic optical correlator. Compared to a recently demonstrated photorefractive quantumwell device, which requires two lasers at different wavelengths and has a 1µs response time, the cesium correlator has a faster switching time (30 ns) and takes an order of magnitude less light intensity.
Fiber laser emits in the UV and at 412 nm
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