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The results on occurrence of high-order harmonic generation are presented in a two-electron quantum dot molecule. The model system is in very good agreement with a model system based on level crossing theory that is used for the derivation of a relation for the cutoff frequency of the harmonics.

Research was conducted to provide a solution to the problem of electrostatics of the conducting double spheres of arbitrary radii placed in an arbitrary potential field. The approach was based on Kelvin's transformation combined with reflection and translation characteristics for harmonic functions. The proposed theorem admits interpretation of the image system for several imposed potentials in the presence of the two-sphere assembly.

Temperature tunability in AgGaSe2 crystals are investigated to enable the application of AgGaSe2 in nonlinear optics. For various temperatures of the crystal, tunable second harmonic generation from the carbondioxide laser radiation is determined. The tuning is small, and experimental results agree with results obtained from dispersion experiments.