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Using phase-conjugate beam generated by second-order nonlinear process, blurred images caused by atmospheric turbulence were fully recovered. Due to instantaneous response, it is perhaps the only scheme for efficiently recovering image distorted by atmospheric turbulence.
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.
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