Patent ID: 9102011
Filing Date: 2015-08-11
Classification: B23K,Y10T

Abstract:
1. A photoacoustic compression method for machining a transparent target material, comprising the steps of: applying a laser beam having at least one burst of laser pulses, said laser beam operating at a wavelength less than 5 μm, a laser burst pulse repetition rate between 1 Hz to 2 MHz having a number of subpulses in the range of 1 to 50 per burst of said laser pulses, and, each pulse having burst pulse energy of 5-500 μJ, from a laser beam source to a distributive focus lens focusing assembly which focuses said laser pulses, prior to application of said laser pulses to said surface of said transparent target; total pulse energy or fluence applied to said transparent target at a spot where said laser pulses contact a surface of said transparent target, said spot being the point of initiation of machining on said transparent target determined by said wavelength, said laser burst pulse repetition rate, said number of subpulses per burst, and said burst pulse energy; and, adjusting said wavelength, adjusting said laser burst pulse repetition rate, adjusting said number of subpulses per burst, and adjusting said energy per pulse to initiate and propagate photoacoustic compression machining, and prevent ablative machining.