Laser apparatus for material processing

H - Electricity – 01 – S

Patent

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Details

H01S 3/23 (2006.01) B23K 26/06 (2006.01)

Patent

CA 2522800

Apparatus for material processing, which apparatus comprises a rare-earth doped fibre (1), a laser diode source (2), a short pulse laser (18) and a controller (9), wherein the rare-earth doped fibre (1) is pumped by the laser diode source (2) to provide optical radiation (10), and the optical radiation (10) emitted by the rare-earth doped fibre (1) is combined with optical radiation (11) emitted by the short pulse laser (18), the apparatus being characterised in that the controller (9) synchronizes the optical radiation (10) emitted from the rare-earth doped fibre (1) with the optical radiation (11) emitted by the short pulse laser (18) to provide a plurality of pulses (5) comprising a pre-pulse (21) and a main pulse (22), the average peak power (23) of the pre-pulse (21) being greater than the peak power (24) of the main pulse (22).

L'invention concerne un appareil à laser pour traitement de matériaux qui comprend une fibre dopée aux terres rares (1), une source à diodes laser (2), un laser à impulsions brèves (18) et un contrôleur (9), ladite fibre dopée aux terres rares (1) étant pompée au moyen de la source à diodes laser (2) de façon à générer un rayonnement optique (10). Le rayonnement optique (10) émis par la fibre dopée aux terres rares (1) est combiné au rayonnement optique (11) émis par le laser à impulsions brèves (18). L'appareil est caractérisé en ce que le contrôleur (9) synchronise le rayonnement optique (10) émis par la fibre dopée aux terres rares (1) avec le rayonnement optique (11) émis par le laser à impulsions brèves (18) de manière à générer une pluralité d'impulsions (5) comprenant une pré-impulsion (21) et une impulsion principale (22), la puissance de crête moyenne (23) de la pré-impulsion (21) étant supérieure à la puissance de crête (24) de l'impulsion principale (22).

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