Method of and material processing apparatus for optimising the focus of a fibre laser; method of measuring changes in the focus of a fibre laser
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United States of America Patent
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Jan 12, 2016
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app pub date -
Jul 19, 2011
filing date -
Aug 16, 2010
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Abstract
A method of optimizing the focus of a fibers laser is described, which comprises positioning the output of a fibers laser relative to a workpiece; measuring at least a portion of back reflected radiation from the workpiece (step 52); determining an integral of this; changing the relative position of the output and the workpiece one or more times (step 54,56), each time determining an integral of values for the back-reflection, and using the integrals to determine optimum focus.
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