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It is revealed that the orbital angular momentum is conserved during the spontaneous parametric down-conversion of a higher-order Bessel beam propagating in a cubic nonlinear medium. This is the result of transverse selection of the sponta- neously arising optical elds in an optical parametric generator pumped by Bessel beam, due to transverse phase matching of interacting conical waves.

Parametric down-conversion of higher-order Bessel optical beam in cubic nonlinear medium