Patent ID: 6859335
Filing Date: 2005-02-22
Classification: A61F,G02B,G02F

Abstract:
1. A method of programmed displacement for prolong usage of an optical element under the irradiation of an intensive laser beam, comprising the steps of: directing said intensive laser beam in a predetermined direction toward and passing through said optical element; providing a driving mechanism to displace said optical element with respect to said intensive laser beam; providing a microprocessor control unit to control said driving mechanism to move in a step by step fashion; providing a monitoring means to monitor the intensity of an output beam from said optical element; scanning said optical element to determine initial defect locations of said optical element; storing initial defect locations in said microprocessor control unit; displacing said optical element step by step over the non-defect area of said optical element with a predetermined short interval between steps; and repeating said step of displacing said optical element again and again over said non-defect area of said optical element.