Method of making sub-surface photoalterations in a material

A - Human Necessities – 61 – F

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A61F 9/01 (2006.01) B23K 26/00 (2006.01) B23K 26/08 (2006.01)

Patent

CA 2706367

A method of photoaltering a material using a puised laser beam includes selecting a first pulse energy and a first focal point separation based on a relationship of pulse energy and focal point separation combinations enabling layer separation of the material by photoalteration, and scanning the pulsed laser beam along a scan region at the first pulse energy and the first focal point separation. The relationship has a slope and has a distinct change in the slope. The distinct change in the slope is associated with a second pulse energy of the relationship, and the first puise energy is equal to or less than the second pulse energy.

La présente invention concerne un procédé de photo-altération d'un matériau à l'aide d'un faisceau laser à impulsions qui consiste à sélectionner une première énergie d'impulsion et une première séparation de foyer sur la base d'une relation d'associations d'énergie d'impulsion et de séparation de foyer qui permet une séparation de couche du matériau par photo-altération, et à balayer le faisceau laser à impulsion le long d'une région de balayage à la première énergie d'impulsion et la première séparation de foyer. La relation possède une pente et présente un changement distinct dans la pente. Le changement distinct dans la pente est associé à une seconde énergie d'impulsion de la relation, et la première énergie d'impulsion est égale ou inférieure à la seconde énergie d'impulsion.

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