"upconversion" meaning in English

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        "The process by which two photons combine in a nonlinear medium to produce a higher-energy photon with a frequency that is the sum of those of the two photons"
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        "(physics) The process by which two photons combine in a nonlinear medium to produce a higher-energy photon with a frequency that is the sum of those of the two photons"
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        "Conversion of a lower radio frequency to a higher frequency, possibly using a mixer."
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