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We have observed frequency upconversion of the incoming photons within the communication band to a visible band in a gallium phosphide crystal. Such a crystal is capable of reaching the single-photon detection level.
We implemented single-photon detector in 1500-nm band based on frequency up-conversion in nonlinear waveguide at pump wavelength of 1920 nm. Ultralow dark count rate and signal photon detection rate are 20 s−1 and 56.8 s−1.
We have implemented a single-photon detector in the 1500-nm band based on frequency up-conversion in a MgO-doped periodically-poled LiNbO3 waveguide, with a record-low dark count rate and a record-low detectable signal photon rate.
Terahertz (THz) radiation can penetrate nonmetallic materials and nonpolar materials, and has low photon energy, therefore THz imaging has drawn more attention. The moment function of an image has wide applications on pattern recognition and target classification. The paper has applied image segmentation to Continuous-Wave THz point-to-point scanning reflecting image depending on Otsu's method. The...
A nonlinear networked control system based on FNN (fuzzy neural network) control which is used to solve uncertainty problems was proposed in view of that the nonlinear systems are often involved in uncertainties, complex architecture and difficulty in modeling and simulating under network conditions. Based on the Matlab/Simulink modularized TPCS (two inverted pendulums coupled by a spring) modeling...
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