Laser cutting method and equipment, with means for modifying the laser beam quality factor by a diffractive optical component

An optical device, diffractive optics technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of poor performance and high price

Inactive Publication Date: 2011-08-10
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this solution is not conceivable in an industrial environment where intensive handling of optical fibers is not recommended
Also proposed is the use of fiber optic couplers, which are expensive components whose performance degrades over time

Method used

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  • Laser cutting method and equipment, with means for modifying the laser beam quality factor by a diffractive optical component
  • Laser cutting method and equipment, with means for modifying the laser beam quality factor by a diffractive optical component
  • Laser cutting method and equipment, with means for modifying the laser beam quality factor by a diffractive optical component

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Embodiment Construction

[0042] Such as Figure 1-4 As shown in and 9, for cutting with a laser beam 10, a laser cutting unit is generally used comprising a laser source 1, also called a laser generator or a laser device, which is coupled to a delivery fiber 2 in order to generate an incident laser beam 10, said incident laser beam 10 propagates to a focusing head 3 comprising a laser nozzle 4 disposed facing a workpiece 30 to be cut.

[0043] Advantageously, the laser source 1 is a source consisting of ytterbium-doped fibers, that is to say comprising several fibers containing ytterbium (Yb) or doped with ytterbium, said laser source 1 being used to generate laser radiation. Such ytterbium fiber laser sources are widely commercially available.

[0044] Optionally, the laser source 1 can also be an erbium-doped fiber source.

[0045]The focusing head 3 is supplied with auxiliary gas via a gas inlet 5 provided in the wall of the focusing head 3, and from a gas source such as one or more cylinders, st...

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Abstract

A method of cutting a workpiece (30) to be cut by a laser beam (10), in which an incident laser beam (10) is generated that has an initial beam parameter product (BPP), given by means of a laser source (1), preferably an ytterbium-doped or erbium-doped fibre laser source, coupled to at least one optical fibre for conveying the beam. Said incident laser beam (10) is brought to a focusing head (3, 4) comprising at least one optical focusing device (14). The incident laser beam (10) is focused by means of said optical focusing device (14), so as to obtain a focused laser beam, and the workpiece (30) is cut by means of the focused laser beam. According to the invention, the quality factor of the incident laser beam (10) is adjusted or modified by means of an optical device (16) designed to be able to modify or vary the BPP of a laser beam so as to obtain a modified focused laser beam (10b) having a modified BPP which is different from the BPP of said incident laser beam. Associated equipment for implementing said method.

Description

technical field [0001] The invention relates to a laser cutting method whose efficiency is increased by using an optical device for modifying the quality of a laser beam, in particular a laser beam emanating from an ytterbium-doped fiber laser device. Background technique [0002] CO 2 Lasers are widely used in industry to cut metal and non-metal materials. [0003] Solid-state lasers such as ytterbium-doped fiber lasers have also benefited from important developments in recent years and combine multi-KW power levels with excellent beam quality, which is comparable to bulk solid-state lasers, namely Nd:YAG (neodymium-doped yttrium aluminum Garnet) lasers are different. [0004] In addition to the properties that make fiber lasers a very suitable laser source for the industrial cutting of metallic materials (the properties in this case are: better absorbed by metals and able to be transmitted through optical fibers than CO 2 In addition to the shorter wavelength, smaller s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/06B23K26/38
CPCB23K26/38B23K26/06
Inventor F·白里安G·巴勒里尼I·德贝克尔H·马扎奥伊E·弗娜
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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