Laguerre-Gaussian beam transformations by the double-phase-ramp converter: singular skeleton formation and its sensitivity to small misalignments

Anna N. Khoroshun; Aleksey V. Chernykh; Halyna O. Tatarchenko; Aleksandr Ya. Bekshaev; Aleksandr A. Akhmerov

doi:10.1117/12.2303901

18 January 2018 Laguerre-Gaussian beam transformations by the double-phase-ramp converter: singular skeleton formation and its sensitivity to small misalignments

Anna N. Khoroshun, Aleksey V. Chernykh, Halyna O. Tatarchenko, Aleksandr Ya. Bekshaev, Aleksandr A. Akhmerov

Author Affiliations +

Proceedings Volume 10612, Thirteenth International Conference on Correlation Optics; 1061203 (2018) https://doi.org/10.1117/12.2303901
Event: Thirteenth International Conference on Correlation Optics, 2017, Chernivtsi, Ukraine

Abstract

A double-phase-ramp (DPR) converter is known as an element introducing the screw dislocation into an input beam with smooth wavefront, or increasing (decreasing) the topological charge of the input beam with optical vortex (OV). We study the features of the set of phase singularities (singular skeleton, SS) formed within the Laguerre-Gaussian beam LG₀⁴ after passage through the chargelowering DPR converter. The main attention is paid to the SS sensitivity to small transverse misalignments in horizontal, vertical and diagonal directions of the DPR converter with respect to the nominal centered position. The obtained results are compared with the SS characteristics typical for the case of perfect DPR alignment. It is shown that different OVs in the transformed field have different misalignment sensitivity. Conditions enabling especially high sensitivity of the separate OVs are revealed and discussed.

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Anna N. Khoroshun, Aleksey V. Chernykh, Halyna O. Tatarchenko, Aleksandr Ya. Bekshaev, and Aleksandr A. Akhmerov "Laguerre-Gaussian beam transformations by the double-phase-ramp converter: singular skeleton formation and its sensitivity to small misalignments", Proc. SPIE 10612, Thirteenth International Conference on Correlation Optics, 1061203 (18 January 2018); https://doi.org/10.1117/12.2303901

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