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Third Harmonic Generation (THG) is a process whereby light is generated at a wavelength which is 1/3 of the pump wavelength, and it is achieved by a two stage interaction. The first stage is SHG of the pumping laser. The second stage is Sum-Frequency Generation of the pump and second harmonic, yielding the third harmonic.
Raicol Crystals provides the following types of crystals for SHG applications: