Non-diffractive two-dimensional optical lattice period adjustment system based on zoom lens

Abstract

The invention relates to a non-diffraction two-dimensional optical lattice period adjusting system based on a zoom lens. The system comprises a laser, a first half-wave plate, a lens group for expanding beams, a beam splitting prism, a second half-wave plate, a spatial light modulator, a first lens, a mask plate, a reflector, a second lens, a zoom lens, a third lens and a detector. After the light beam retaining the base level information is reflected by the reflector, the light beam is interfered behind the reflector through the second lens to form a non-diffraction two-dimensional optical lattice, then sequentially passes through the zoom lens and the third lens and is imaged on the detector, wherein the position of the back focal plane of the zoom lens is kept unchanged during focusing, and the distance between the zoom lens and the third lens is the sum of the back focal length of the zoom lens and the front focal length of the third lens; by adjusting the focal length of the zoom lens, the continuous change of the amplification factor of the beam expanding system is achieved, so that the rapid continuous adjustment of the diffraction-free two-dimensional optical lattice period can be achieved.

Description

technical field

[0001] The invention relates to a rapid continuous adjustment system for the non-diffraction two-dimensional optical lattice period, especially for assisting the light field regulation method based on the spatial light modulator, the multi-core optical fiber interference method, etc. to generate the non-diffraction two-dimensional optical lattice. system. Background technique

[0002] The optical lattice is a periodic potential well pattern generated by the intersection and interference of multiple laser beams. As early as 1989, Bell Laboratories Steven Zhu and others used two laser beams to propagate in opposite directions to generate an interference standing wave field, and realized a one-dimensional optical lattice for the first time in the experiment. Subsequently, Grynberg et al. laid out the interference of multiple laser beams according to certain rules, successfully obtained two-dimensional optical lattices and three-dimensional optical lattices, and...

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