System and method for scanning a pulsed laser beam

摘要

System and method of photoaltering a region of a material using a pulsed laser beam. The method includes scanning the pulsed laser beam in a first portion of the region with a first pattern, scanning the pulsed laser beam in a second portion of the region with a second pattern, and separating a flap of the material at the region. The system includes a laser, a controller selecting at least first and second patterns, and a scanner operable in response to the controller. The first pattern has a first maximum acceleration associated with the second portion, and the second pattern has a second maximum acceleration associated with the second portion. The second maximum acceleration is less than the first maximum acceleration. The scanner scans the pulsed laser beam from the laser in the first portion with the first pattern and in the second portion with the second pattern.

主权项

1. A system for photoaltering a cornea, the cornea having first and second regions and a surface layer, the second region being a central region surrounded by the first region, and the first and second regions underlying the surface layer of the cornea, the system comprising:
a laser configured to produce a pulsed laser beam; a controller configured to select at least a first laser scan pattern and a second laser scan pattern that is different than the first laser scan pattern, the laser scan patterns each based on a continuous scan of the pulsed laser beam, the first laser scan pattern having a first maximum scanner movement acceleration associated with the second region, the second laser scan pattern having a second maximum scanner movement acceleration associated with the second region, the second maximum scanner movement acceleration being less than the first maximum scanner movement acceleration; and a scanner operable in response to the controller to:
transmit the pulsed laser beam to the first region of the material in accordance with only the first laser scan pattern;transmit the pulsed laser beam to the second region of the material in accordance with only the second laser scan pattern; andtransmit the pulsed laser beam to the first and second regions of the cornea to at least partially separate the surface layer from the cornea.