Hollow light beam converting device

Abstract

A hollow light beam converting device comprises a focusing lens, an optical fiber coupling lens and a multi-mode optical fiber. The focusing lens is used for receiving a light beam from a light source. The optical fiber coupling lens is arranged behind the focusing lens, the optical axis of the optical fiber coupling lens is intersected with the optical axis of the focusing lens, and light emitted from the focusing lens is shot into the optical fiber coupling lens in an inclined mode. The multi-mode optical fiber is arranged behind the optical fiber coupling lens, the optical fiber coupling lens is arranged in front of the input end of the multi-mode optical fiber, a short focus shaping lens is arranged behind the output end of the multi-mode optical fiber, and the output end of the multi-mode optical fiber is located at the focus position of the short focus shaping lens. The hollow light beam converting device is capable of generating a hollow light beam with a full black central macula, the coupling efficiency is high, the obtained hollow light beam is good in macula quality and can be applied to an atom conduit, optical tweezers, an optical wrench and other devices, the phenomenon that a traditional solid light beam burns cells in the displacement process or the surgical operation process of tiny objects is avoided, and thus the cell viability is improved.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to a beam conversion device for converting a Gaussian beam into a hollow beam. Background technique [0002] Light is a special substance that carries energy and momentum. When light interacts with matter, they exchange energy and momentum and produce various effects. When the momentum is exchanged between light and matter, the object irradiated by light can be subjected to a force or torque, that is, the mechanical effect of light is produced. Optical tweezers for trapping tiny particles is a typical application of the mechanical effect of light. In daily life, the tweezers we use to hold objects are all tangible objects, and a certain force is applied through the tweezers to clamp the object; while optical tweezers are a special light field. When this light field interacts with the object, the object is affected by the light. So as to achieve the effect of being clamped, and th...

AI Technical Summary

Problems solved by technology

Among them, the evanescent wave method is limited to the surface of the medium, and the action area is very small (μm level); the grating and pyramid used in the computational holography method or the pyramid method are complex in the manufacturing process and difficult to implement, and the two methods produce The dark spot in the center of the hollow beam is not completely black; the method of generating a hollow beam with a hollow fiber has a low coupling efficiency, only 50%

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