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Pronunciation varies by accent · noun
(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.
Use upconversion when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Upconversion means (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.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use upconversion where its definition matches the intended context.
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