Optical fiber parameter design method, conical optical fiber and efficient laser water beam coupling device

Abstract

The invention provides an optical fiber parameter design method, a conical optical fiber and a laser water beam efficient coupling device. The optical fiber parameter design is used for a conical optical fiber in a laser water beam efficient coupling device, and comprises the following steps: carrying out priority ranking on a plurality of optical fiber parameters; selecting a safety coefficient k based on a first coupling basic condition, designing a cylindrical optical fiber diameter d based on processing precision and water beam stability, and preselecting a focusing lens to obtain an incident angle alpha and a Gaussian laser beam waist radius omega0; based on a mathematical induction method, selecting total internal reflection times n of laser in the conical optical fiber and a half-cone angle beta of the conical optical fiber; based on an efficient coupling method, calculating the height h of the conical fiber and the diameter D of the coupling end part; respectively substituting the plurality of optical fiber parameters into the first coupling basic condition and the second coupling basic condition for checking calculation; and adjusting a plurality of optical fiber parameters of the tapered optical fiber according to a priority sequence based on the checking calculation result until the first coupling basic condition and the second coupling basic condition are met.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to an optical fiber parameter design method, a tapered optical fiber and a high-efficiency coupling device for laser water beams. Background technique [0002] With the increasing application of fiber laser in civil industry, defense industry, and medical industry, fiber laser technology has also developed rapidly in recent years. At present, this technology has been widely used in the cutting of metal sheets, and at the same time it has shown great potential in welding, cladding, cleaning and other fields. However, with the increase of the fields covered by the application of fiber laser technology, the problems and challenges it faces are also increasing. [0003] The existing coupling laser processing device usually makes the laser incident from above the device, passes through the glass plate, and after passing through the focusing lens, is coupled into the liquid cavi...

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Problems solved by technology

[0005] The invention provides an optical fiber parameter design method, a tapered optical fiber and a high-efficiency coupling device for laser water beams, aiming at solving the problems of laser coupling leakage and laser damage to the coupling device in cylindrical water beams or cylindrical optical fibers, and achieving The design purpose of scientifically and rationally designing high-efficiency coupling devices with the existing conditions, thereby improving the coupling efficiency and service life of the devices

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