This article is cited in 11 papers

Nonlinear optical phenomena and devices

Generation of the second harmonics of Bessel light beams in a KTP crystal

V. N. Belyi^a, N. S. Kazak^a, N. V. Kondratyuk^b, N. A. Khilo^c, A. A. Shagov<sup>b

a</sup> B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk
^b Inter-branch Institute of advanced training Belorussian Polytechnic academy, Minsk-107
^c Division of Optical problems in Informatics, National Academy of Sciences of Belarus, Minsk

Abstract: Theoretical and experimental investigations were made of the characteristic features of doubling the frequency of Bessel light beams by the oe–e interaction in a KTP crystal. All possible and scalar interactions of plane—wave components of Bessel beams were observed experimentally. The spatial structure of the second harmonic in the far zone consisted of a central spot and a concentric ring. The diffraction divergence of the central beam was weak ( ~1.7 mrad). The energy conversion efficiency was ~21% for a Bessel beam, which was three times higher than the efficiency of conversion of the initial laser beam. A theoretical model was based on representation of the field of the second harmonic as a superposition of Bessel beams, which provided a correct description of the observed spatial and energy characteristics of the second harmonic.

PACS: 42.65.Ky, 42.60.Jf

Received: 27.08.1998

 English version: Quantum Electronics, 1998, 28:11, 1011–1016

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