A Device for Directly Generating Narrow Linewidth Vortex Lasers

Abstract

The invention discloses a device for directly generating a vortex beam, belonging to the optical technical field. The device comprises a monolithic laser cavity, which is used for generating a population inversion to provide a gain of light while serving as a non-planar ring optical resonator; a magnetic field application module for generating a magnetic field passing through the laser cavity to generate a Faraday effect to provide a necessary condition for unidirectional light emission; a pumped laser module for focusing into a laser cavity coupled to the laser cavity to cause the gain mediumto generate a population inversion while optimizing the excitation of the vortex resonance laser mode of the cavity by shifting the beam position; and lens modules respectively used for focusing pumping laser and collimating the vortex laser. The invention directly realizes continuous laser with spectrum linewidth of up to 1 kHz by using a Gaussian mode distributed pumping laser and selectively exciting a vortex mode in a monolithic non-planar cavity.

Description

technical field [0001] The invention belongs to the field of optical technology, and more specifically relates to a device for directly generating narrow-linewidth vortex laser light. Background technique [0002] The vortex beam has a peculiar phase distribution structure, which shows a vortex distribution on the section perpendicular to the propagation direction, and usually shows a ring-shaped beam with a central dark spot on the light intensity distribution. Compared with ordinary Gaussian beams, in addition to the characteristics of phase and intensity distribution, vortex beams also have special orbital angular momentum. At present, this type of beam has been widely used in ultramicroscopic imaging, light manipulation, high-capacity optical communication, quantum information and nonlinear optics and other technologies. Especially in optical communication, the orbital angular momentum of vortex light has been used as an information carrier to effectively improve the si...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problem of directly generating a single-frequency narrow-linewidth vortex laser, overcome the complexity of existing systems based on multiple optical components to generate narrow-linewidth vortex beams, and propose A device capable of generating a narrow-linewidth single-frequency vortex laser with high stability and simplicity and compactness, the device also has the characteristics of simple operation and high stability

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