| http://www.w3.org/ns/prov#value | - B.4 Photon Mixing for Molecular Contrast in OCT There are a number of nonlinear optical processes which may be used for molecular contrast that fall under the general title photon mixing, including second harmonic generation (SHG), third harmonic generation (THG), sum frequency generation (SFG), and difference frequency generation (DFG).
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