Patent ID: 6755819
Filing Date: 2004-06-29
Classification: A61F

Abstract:
A device with a first laser radiation source for material ablation of partial ablation regions of a surface of a radiation-transparent or diffusive object having a thickness, said device comprising:a control device, said first laser radiation source emitting a first laser radiation being controllable by the control device, a measuring device having a Michelson interferometer, said Michelson interferomoter having a reference arm, a measuring arm and a second laser radiation source, said second laser radiation source emitting a measuring beam with a center wavelength in a region of 1,310 nm traveling as reference radiation in said reference arm and as measuring radiation in said measuring arm; and a monomode fiber for said center wavelength in the measuring arm so that an optical wavelength in air can be compensated acceptably in the measuring arm; an electronic evaluation unit being connected by a signal to the control device, said electronic evaluation unit using measured values determined with the measuring device for evaluating a relative distance of said partial ablation region from a reference value together with the thickness of the object, and for evaluating a prescribed thickness profile, and using the evaluated thickness profile to control the first laser radiation source, the latter being released only if the control device has determined a stored distance value lying in a prescribed tolerance range, and/or has determined an inclination of the partial ablation region within stored tolerance values.