| http://www.w3.org/ns/prov#value | - Although it should be understood that the correctness of the theory of the invention is not essential to the practice thereof, it is believed that the generation of second harmonic optical radiation in such liquids as nitrobenzene is attributable to the third order coupling of the D.C. applied field of the battery 40 with the fundamental optical frequency f (the latter taken twice) in the nonlinea
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