Device for generating arbitrary vector beams based on Mach-Zehnder interferometer

Abstract

The invention relates to a device for generating arbitrary vector beams based on a Mach-Zehnder interferometer. The device comprises a fundamental-mode linear polarization laser source, a half-wave plate, two polarization splitting prisms, two totally reflecting mirrors, two discontinuous wave plates and an electro-optic phase modulator, and the fundamental-mode linear polarization laser source generates a fundamental-mode Gaussian beam which is divided into two paths of orthogonal linearly-polarized light via the half-wave plate and the first polarization splitting prism. The vertically polarized light is converted into TEM01 vertically polarized light via the first 45-degree totally reflecting mirror and the first discontinuous wave plate; the horizontally polarized light is converted into TEM10 horizontally polarized light via the second discontinuous wave plate, and the TEM10 horizontally polarized light is reflected by the electro-optic phase modulator and the second 45-degree totally reflecting mirror and then is coaxially and coherently superposed with the TEM01 vertically polarized light at the position of the second polarization splitting prism to generate to vector polarized light. By the device, arbitrary phi0 and delta combined vector beams can be generated, and continuous and quick switching between different vector beams can be realized.

Description

technical field [0001] The invention belongs to the technical field of interference synthesis of vector beams, in particular to a device for generating arbitrary vector beams based on a Mach-Zehnder interferometer. Background technique [0002] The vector beam is different from the usual polarized light (linear polarization, circular polarization and elliptical polarization), and its polarization state distribution changes with the position in the cross section. As two special cases of vector beams, the polarization states of the radially and angularly polarized light spaces are distributed along the radial direction and the angular direction, respectively, and the light intensity distributions are all in the shape of a hollow ring. Due to its unique polarization distribution characteristics, radially polarized light produces a strong longitudinal electric field component at the focus and a small focal spot when focused by an aplanatic high numerical aperture lens; while ang...

AI Technical Summary

Problems solved by technology

Although this method can realize the generation of a variety of vector lights and meet certain usage requirements, the adjustment of the optical path is complicated, and it is impossible to continuously and quickly switch between different types of vector lights

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