B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 26/00 (2006.01) B23K 26/06 (2006.01) B23K 26/067 (2006.01) B23K 26/14 (2006.01) B23K 26/16 (2006.01) B23K 26/18 (2006.01)
Patent
CA 2468723
Methods and apparatus for material modification using laser (302) bursts including appropriately timed laser pulses (702, 704) to enhance material (314, 366) modification. In one implementation, a method for material modification comprises the steps of: providing bursts of laser pulses, wherein each burst comprises at least two laser pulses (702, 704), wherein each laser pulse has a pulse duration within a range of between approximately 10 ps and 100 ns, wherein a time between each laser pulse of each burst is within a range of between approximately 5 ns and 5 us; a time between successive bursts is greater than the time between each laser pulse comprising each burst; and directing the bursts upon a workpiece (314, 366), wherein an intensity of a primary laser pulse (702) of each burst exceeds a damage threshold (802) of the workpiece.
Cette invention a trait à des procédés ainsi qu'à l'appareil correspondant permettant de modifier un matériau au moyen de rafales laser (302) constituées d'impulsions laser (702, 704) minutées de façon appropriée et ce, afin d'améliorer le processus de modification du matériau (314, 366). Dans un mode de réalisation, ce procédé consiste à envoyer des rafales d'impulsions laser, chaque rafale en comptant au moins deux (702, 704), et chaque impulsion ayant une durée comprise entre 10 ps et 100 ns environ. L'intervalle de temps entre chaque impulsion de chaque rafale est compris entre 5 ns et 5 µs environ. L'intervalle de temps entre chaque rafale est supérieur à l'intervalle de temps existant entre chaque impulsion laser de chaque rafale. On dirige, dans le cadre de ce procédé, les rafales sur la pièce à usiner (314, 366), l'intensité de la première impulsion laser (702) de chaque rafale étant supérieure au seuil de détérioration (802) de la pièce à usiner.
Banks Paul S.
Forsman Andrew C.
Perry Michael D.
General Atomics
Macrae & Co.
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