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Method for directly generating multiple vortex beams in a cavity

A vortex beam and multi-vortex technology, applied in the field of laser, can solve the problems of increasing the information carrying capacity of optical communication and the limited amount of information carried, and achieve the effect of high purity and stable transmission

Active Publication Date: 2018-12-18
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

At present, the methods for directly generating vortex beams in the cavity mainly include ring beam pumping method and space loss modulation method, but these methods can only generate vortex beams of a single order, and the amount of information carried is very large for the application in optical communication. limited, while multi-vortex beams can greatly increase the information carrying capacity of optical communication through space division multiplexing

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  • Method for directly generating multiple vortex beams in a cavity
  • Method for directly generating multiple vortex beams in a cavity
  • Method for directly generating multiple vortex beams in a cavity

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Embodiment

[0020] A method for directly generating multi-vortex beams in a cavity is characterized in that the method includes the following steps:

[0021] 1) build as figure 1 In the laser structure shown, the laser consists of a pump source 1, a first convex lens 2, a second convex lens 3, a concave mirror 4, a gain crystal 5, and an output coupling mirror 6 with round holes and concentric rings of different sizes engraved on the surface (plane end mirror) composition. The pump source 1 is a laser diode with an emission wavelength of 808nm, which is collimated and focused into the gain crystal 5 through the first convex lens 2 and the second convex lens 3, and the gain crystal 5 is a neodymium-doped yttrium vanadate crystal (Nd: YV04), The front and rear surfaces of the crystal are coated with anti-reflection coatings with a wavelength of 1064nm and a wavelength of 808nm. The resonant cavity is composed of a concave mirror 4 and an output coupling mirror 6. The surface of the mirror...

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Abstract

A method for directly generating multiple vortex beams in a cavity. The core of the method is that etching circular microholes and concentric rings of different sizes on the surface of the laser end mirror, and adjusting the circular microholes and the concentric rings to the center of the beam to form a circular and a annular spatial loss modulation, so as to form a plurality of annular net gainregions in the laser cavity, so that the vortex beams of different orders oscillate and output, thereby producing multi-vortex beams directly in the laser cavity. Each vortex beam has the characteristics of high purity and stable transmission. The vortex generation method has important application prospects in space division multiplexing optical communication.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a method for directly generating multi-vortex beams in a cavity. Background technique [0002] The vortex beam has a spiral wavefront, and its wavefront phase changes by 1 times of 2π around the center, and each photon in the beam carries The orbital angular momentum of , where 1 is an integer, is called the topological charge (order) of the vortex beam. The uncertainty of the central phase leads to a phase singularity in the center, and the light intensity distribution is circular. The above characteristics make the vortex beams have a wide range of applications in optical communication, optical micro-manipulation, super-resolution imaging, etc. [0003] LG 01 The Laguerre-Gaussian beam of the mode (vortex beam, 1 is a non-zero integer, called the order of the vortex beam) is the eigensolution of the cylindrically symmetric laser cavity, so the Laguerre-Gaussian vortex can be...

Claims

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Application Information

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IPC IPC(8): G02B27/09
CPCG02B27/0938G02B27/0955
Inventor 谢国强乔桢袁鹏钱列加
Owner SHANGHAI JIAO TONG UNIV
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