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Laser-focusing head with ZnS lenses having a peripheral thickness of at least 5 mm and laser cutting unit and method using one such focusing head

A laser device, edge thickness technology, applied in laser welding equipment, optics, condenser mirrors, etc., can solve problems such as excessive temperature rise, high power density thermal gradient and deformation

Inactive Publication Date: 2015-07-01
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in extremely high power densities and increased thermal gradients and deformations on the optics surface of the focusing head
It was also found that the ability of optical materials to resist laser damage under high-brightness lasers is better than that under conventional CO 2 Laser down difference, because the previous laser has a shorter wavelength and is more sensitive to defects present in the surface coating of the substrate and optical components, causing localized excessive heating

Method used

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  • Laser-focusing head with ZnS lenses having a peripheral thickness of at least 5 mm and laser cutting unit and method using one such focusing head
  • Laser-focusing head with ZnS lenses having a peripheral thickness of at least 5 mm and laser cutting unit and method using one such focusing head
  • Laser-focusing head with ZnS lenses having a peripheral thickness of at least 5 mm and laser cutting unit and method using one such focusing head

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Embodiment Construction

[0041] The cutting device according to the invention comprises a solid-state laser source SL with at least one beam delivery fiber FDC and a focusing head 3, also called cutting head, for delivering and focusing the laser beam onto the part 10 to be cut. on or in it. will be explained below and in image 3 The characteristics and operating range of the unit are shown in .

[0042] The cutting head 3 typically includes optics for optically collimating, redirecting and focusing the laser beam.

[0043] Alternatively, the laser beam is emitted by a solid state laser device or generator, preferably an ytterbium (Yb) doped fiber laser. In laser devices, the lasing effect refers to the optical amplification phenomenon used to generate laser radiation, by means of preferably pumped by a laser diode and fed by one or typically several doped fibers (preferably, ytterbium (Yb) doped silica The amplifying medium composed of optical fiber) obtains the lasing effect.

[0044] The wavelen...

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Abstract

The invention relates to a particular optical configuration employed in a solid-state laser, in particular a fiber laser, cutting head for controlling the problems of focal drift and laser damage of the optics of the focusing head and to a laser unit equipped with such a focusing head, in particular an ytterbium-doped fiber laser unit.

Description

technical field [0001] The present invention relates to specific optical configurations used in solid-state lasers, more particularly to fiber laser cutting heads for controlling the problems of focus drift and laser damage to optical components of the focusing head and to laser devices equipped with such focusing heads, More specifically ytterbium-doped fiber laser devices. Background technique [0002] Unlike solid-state lasers such as Nd:YAG lasers, newer generations of solid-state lasers, such as fiber or disk lasers, benefit from the development and combination of powers in the order of several kW with an excellent figure of merit or BPP (Optical Parameter Product). [0003] In addition to the fact that these lasers are suitable for cutting metallic materials, in this case they are more efficient than CO 2 The laser (10.6μm) has a shorter wavelength (1.07μm), which can be better absorbed by metal and transmitted by optical fiber, with smaller overall size and higher re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/064B23K26/38B23K26/70G02B27/09G02B27/30G02B27/40G02B1/02
CPCG02B27/40G02B27/30G02B19/0014G02B19/0052G02B27/0966B23K26/38B23K26/06B23K26/046
Inventor F·布里安德G·巴勒里尼I·德贝克尔T·茹阿诺H·马扎奥伊E·弗娜
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE