This occurs when two photons simultaneously interact with the material, leading to various nonlinear optical effects, including the generation of higher harmonic frequencies.
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cloro indium(III) 2-tetrabromo-3-tetra-(3,5-di-tert-butylphenoxy)naphthalocyanine
2-(2H-1,2,3-benzotriazol-2-yl)-4-hydroxybenzenecarboxaldehyde
(BROMOMETHYL)TRIPHENYLPHOSPHONIUM BROMIDE
