Abstract
The retracing behavior of the phase-matching angle (RBPA) in many nonlinear optical crystals for second harmonic generation (SHG) has been demonstrated by calculation. The generality of this phenomenon is successfully explained by a theoretical analysis based on classical optics. The wavelengths of the fundamental waves and phase-matching angles for describing the RBPA of eight kinds of crystals are presented. Furthermore, we point out that RBPA exists generally in both uniaxial and biaxial crystals for both type I and type II SHG.
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