Device and method for generating axisymmetric polarized light

Abstract

The invention relates to a device and a method for generating axisymmetric polarized light. A laser is connected with an optical fiber beam splitter through a single-mode polarization-maintaining optical fiber and is connected with two polarization rotators through single-mode polarization-maintaining optical fibers the device for generating axisymmetric polarized light has two output routes; one route of polarization rotator is connected with an optical fiber beam combiner through a few-mode polarization-maintaining optical fiber of which the middle section is provided with an inclined optical fiber grating; the other route of polarization rotator is connected with the optical fiber beam combiner through a few-mode polarization-maintaining optical fiber and an optical fiber phase adjustor sequentially, wherein the middle section of the few-mode polarization-maintaining optical fiber is provided with an inclined optical fiber grating; the inclination directions of the two routes of optical fiber gratings are mutually orthogonal; and the optical fiber beam combiner symmetrically polarizes light through the few-mode polarization-maintaining optical fibers. Radial, angular and generally axially symmetrical polarized light beams can be obtained by only adjusting the two polarization rotators and the phase adjustor. The method is a full-optical fiber type passive generating method. The problems of complexity of a non-optical fiber type vector polarized light generating device and inefficient flexibility of other full-optical fiber type passive generating methods are solved. The device is simple in structure and the method is high in flexibility. Kinds of axisymmetric polarized lights can be conveniently obtained.

Description

technical field [0001] The invention relates to an optical application method, in particular to a device and method for generating axially symmetrical polarized light using an orthogonally inclined optical fiber grating. Background technique [0002] On the cross-section perpendicular to the propagation direction of the beam, the field strength and polarization state of the vector polarized light are non-uniformly distributed in space, which is a kind of solution that satisfies Maxwell's equations. Axisymmetrically polarized beams are a special case, and their mode fields and polarization states are distributed axisymmetrically. According to the different polarization state distributions, they can be divided into three categories, namely, figure 1 Radially polarized light shown, such as figure 2 azimuthally polarized light as shown with image 3 The generally axisymmetrically polarized light is shown, wherein the generally axisymmetrically polarized light can be obtained ...

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