Patent ID: 8664562

Claim:
A system for forming an aperture in a microfeature workpiece, the system comprising: a laser configured to produce a laser beam along a beam path; an electromagnetic radiation sensor positioned along the beam path to sense the laser beam; a workpiece carrier; a metrology tool configured to measure a first thickness at a first location and a second thickness at a second location of the microfeature workpiece, the first and second locations being different from each other; and a controller operably coupled to the laser, the electromagnetic radiation sensor, the metrology tool, and the workpiece carrier, the controller having a computer-readable medium containing instructions to perform a method comprising— positioning the microfeature workpiece in the beam path with the workpiece carrier; directing the metrology tool to measure the first thickness at the first location of the microfeature workpiece; directing the laser beam toward the microfeature workpiece to form the aperture in the microfeature workpiece at the first location; sensing the laser beam pass through the microfeature workpiece with the electromagnetic radiation sensor; recording a number of pulses of the laser beam and/or an elapsed time when sensing the laser beam pass through the microfeature workpiece; directing the metrology tool to measure the second thickness at the second location of the microfeature workpiece; and controlling the laser beam based on the recorded number of pulses and/or the elapsed time, the first thickness, and the second thickness to form another aperture at the second location of the microfeature workpiece.