Interaction of Bessel optical vortices in quadratic nonlinear medium

• Published in: Optics communications Vol. 197; no. 4; pp. 419 - 429
• Main Authors: Stabinis, A., Orlov, S., Jarutis, V.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2001; Elsevier Science
• Subjects: Beam characteristics: profile, intensity, and power; spatial pattern formation; Bessel beam; Exact sciences and technology; Frequency conversion ; harmonic generation, including high-order harmonic generation; Fundamental areas of phenomenology (including applications); Harmonic generation, frequency conversion; Laser optical systems: design and operation; Nonlinear optics; Optical vortex; Optics; Physics; Second harmonic generation; 42.65.Ky; Second harmonic generation; 42.60.Jf; Bessel beam; Optical vortex; Beam profiles; Bessel beams; Phase-matching; Theoretical study; Optical frequency conversion; Nonlinear optics
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/S0030-4018(01)01388-8

A vortical structure of second harmonic (SH) field excited in quadratic nonlinear medium by combined beam composed of two multiple-charged Bessel vortices of fundamental frequency (FF) is analyzed. An emergence of the pairs of single-charged vortices in SH beam caused by interaction of Bessel vortices is revealed. The charges of the vortices in these pairs can be the same (both positive), as well as different. We show, that in spite of any variation in the number of vortices in SH beam, the doubling of total topological charge of FF beam takes place in SH generation process. The derived results correspond to the negligible pump depletion in the case of exact noncritical phase matching and neglect of SH beam diffraction.