Adjustable vortex array generation method and device based on optical induction atomic lattice

Abstract

The invention belongs to the technical field of optical communication, and relates to an adjustable vortex array generation method and device based on an optical induction atomic lattice. The method comprises the following steps: S1, the frequencies of coupling light and input light are respectively detuned and locked on D1 and D2 hyperfine structure transition lines of alkali metal atoms; S2, the coupled light is divided into two light beams, the two light beams are incident to a depolarization beam splitter prism from the two sides of the incident plane of the depolarization beam splitter prism at different incident angles and are divided into four light beams, two light beams of the four light beams are emitted at an included angle and generate a first standing wave field in the propagation direction, the other two light beams generate a second standing wave field in the propagation direction, and after the direction of the first standing wave field is rotated by 90 degrees, the first standing wave field beam and the second standing wave field beam are combined and incident into an alkali metal steam pool to form a two-dimensional optical induction atomic lattice modulated in space periodically; and S3, after the input light passes through a vortex wave plate, the input light and an interference standing wave field formed by the coupling light oppositely coincide and are incident to the alkali metal steam pool, and after atomic lattice diffraction, a vortex array is output. The vortex array can be dynamically generated and controlled.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to a method and a device for generating an adjustable vortex array based on an optically induced atomic lattice. Background technique [0002] Vortex beams have helical phase wavefronts and non-zero orbital angular momentum, and are currently widely used in optical tweezers, microscopic imaging, quantum computing, and optical communications. With the further development of people's needs, a single vortex beam is far from being able to meet the urgent requirements of large data storage capacity and mass capture capability. Therefore, a vortex array composed of multiple vortex beams came into being. Compared with single vortex beams, vortex arrays have been widely used in the fields of multi-particle trapping, fast micromachining, and improving communication channel capacity in recent years. At present, there are many methods for generating vortex optical arrays in the fi...

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Problems solved by technology

Among them, the use of Damman gratings and some special patterned metasurfaces to generate equal-energy vortex arrays has attracted more attention. However, due to the complexity of making these spatially periodic structures, it is difficult to adjust them once they are made. The vortex arrays generated by these methods Vortex arrays are not adjustable

Using different diffraction gratings constructed by spatial light modulators is an effective way to generate tunable vortex arrays, however, the arrays obtained by this method are often limited by the principle of diffraction, high diffraction order energy is low, and the spatial light The refresh rate of modulator modulation is relatively slow, which is not conducive to the use of tunable vortex arrays in related applications

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