Patent ID: 7888620
Filing Date: 2011-02-15
Classification: B23K

Abstract:
1. A method of forming two laser processing beams with controlled stability at a work surface of a target specimen, comprising: providing first and second mutually coherent laser beams propagating along separate first and second beam paths; combining the first and second mutually coherent laser beams in a common beam path portion of an optical component train to perform an optical property adjustment that is common to the first and second laser beams; separating the first and second previously combined laser beams into third and fourth laser beams that propagate along respective third and fourth beam paths, one of the third and fourth laser beams contributing a leakage component that copropagates in mutual temporal coherence with the other of the third and fourth laser beams; and reducing an effect of the mutual temporal coherence of the leakage component and the other of the third and fourth laser beams with which the leakage component copropagates to deliver for concurrent incidence on the target specimen stabilized first and second processing beams corresponding to the third and fourth beams.