Abstract
The transverse second harmonic (SH) intensity distribution during collinear phase matching in the far field was studied in [i, 2]. It was shown that as a consequence of nonlinear medium anisotropy along the laser beam propagation path, which does not coincide with the direction of exact phas~ matching, a wave mismatch Ak arises which brings about spatial beats in the 8H amplitude. As a result of this, during collinear nonlinear interaction of diverging laser beams, the SH intensity distribution in the far field takes the form of alternating light and dark bands. The angular structure fails to be established during noncollinear SH generation and a uniform background is observed in the intensity distribution of the harmonic [ 2].
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