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Abstract
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Conversion efficiency of second-harmonic generation (SHG) in a multicrystal structure arrangement,
under linearly absorption of interacting waves was analytically investigated. Different linear absorption
and nonlinear interaction coefficients were considered for both of the fundamental and the second
harmonic waves in cascade layers. The intensity-constant approximation on fundamental wave radiation
was applied in calculations. Behavior of conversion efficiency with interaction coherence length of fundamental
wave, phase miss-matching and ratio of linear absorption coefficients were graphically illustrated.
The results are shown that in multicrystal structure scheme, the conversion efficiency can be tuned by the
interaction coherent length and it is possible to compensate the phase differences induced in the previous
layers. The phase compensation between the layers is the physical reason of efficiency improvement.
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