Method and device for outputting hollow laser beam

Abstract

The invention discloses a method for outputting a hollow laser beam. The method includes the steps that (1) a solid beam generated by a laser is shaped through a shaping system to form hollow annular pump light; (2) the hollow annular pump light enters a coupling system along an optical axis in an incidence mode, and the coupling system converts the annular pump light into a hollow beam with an appropriate diameter ; (3) the hollow beam enters a resonant cavity in a coupled mode from one end face of the laser resonant cavity, pumping is performed on a gain medium of the laser, and the gain medium in the resonant cavity is made to absorb the pump light through phase control so as to generate continuous hollow laser output. The invention further discloses a device for outputting the hollow beam. According to the device and method, the incident pump light is converted into a hollow mode from a common solid mode, so that no gain exists at an axis part where the laser oscillates, and hollow laser beam output is achieved through phase control, and the device and method have the advantages of being simple to achieve, high in reliability, high in conversion efficiency and high in output power.

Description

technical field [0001] The invention belongs to the field of lasers, and in particular relates to a method and a device for outputting a hollow laser beam. Background technique [0002] For a long time, solid laser beams have been widely used in traditional laser industries such as cutting, cladding, welding and marking. But in recent years, due to the promotion of application technology, various laser beams with zero central intensity—hollow laser beams have been produced one after another, and a new family of so-called hollow beams (also known as dark hollow beams) is being formed. As a laser catheter, optical tweezers (optical tweezers) and optical wrench, the hollow beam has a wide range of applications in the precise, non-contact manipulation and control of microscopic particles (such as microparticles, nanoparticles, free electrons, biological cells and atoms or molecules, etc.) application. [0003] Due to the generation of hollow beams, in turn, it also promotes th...

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Problems solved by technology

The spot of the hollow beam obtained by this method is composed of many small side lobes. This kind of discontinuous annular hollow beam will have certain limitations in the actual application process. For example, in stimulated loss microscopy, due to the side lobes With the existence of lobes, the fluorescence suppression effect of the hollow beam on the excitation light is not so obvious, resulting in the generation of sporadic impurity fluorescence, which reduces the resolution of stimulated depletion microscopy

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