Optics-to-THz conversion of vortex beams using nonlinear difference frequency generation

• Published in: Kompʹûternaâ optika Vol. 43; no. 6; pp. 983 - 991
• Main Authors: Bagmanov, V.Kh, Sultanov, A.Kh, Gizatulin, A.R., Meshkov, I.K., Kuk, I.A., Grakhova, E.P., Abdrakhmanova, G.I., Vinogradova, I.L.
• Format: Journal Article
• Language: English
• Published: Samara National Research University 01-12-2019
• Subjects: differential frequency generation; nonlinear medium; vortex beams conversion
• ISSN: 0134-2452; 2412-6179
• DOI: 10.18287/2412-6179-2019-43-6-983-991

In this paper, using a modified model of slowly varying amplitudes, a process of optics-to-THZ-conversion of vortex beams based on the nonlinear difference frequency generation in a medium with second-order susceptibility is considered. A theoretical substantiation of the law of topological charge conversion of vortex beams is given – the topological charge of the output THz vortex beam is equal to the difference of the topological charges of the input optical vortex beams. A simulation model of the processes under consideration is implemented.