LASER SCANNING SYSTEM EMPLOYING AN OPTICS MODULE CAPABLE OF FORMING A LASER BEAM HAVING AN EXTENDED DEPTH OF FOCUS (DOF) OVER THE LASER SCANNING FIELD

摘要

A laser scanning system having a laser scanning field, and a laser beam optics module with an optical axis and including: an aperture stop disposed after a laser source for shaping the laser beam to a predetermined beam diameter; a collimating lens for collimating the laser beam produced from the aperture stop; an apodization element having a first and second optical surfaces for extending the depth of focus of the laser beam from the collimating lens; and a negative bi-prism, disposed after the apodization element, along the optical axis, to transform the energy distribution of the laser beam and cause the laser beam to converge to substantially a single beam spot along the far-field portion of the laser scanning field, and extend the depth of focus of the laser beam along the far-field portion of the laser scanning field.

主权项

1. A system, comprising:
a source; an optics module having an optical axis, wherein the optics module comprises:
an aperture stop for shaping the laser beam to a predetermined diameter;a collimating lens for collimating the laser beam shaped by the aperture stop;an apodization element having a first optical surface and a second optical surface; anda negative bi-prism, after the apodization element along the optical axis, for transforming the energy distribution of the laser beam to substantially a single beam spot in a scanning field; and a scanning mechanism for scanning the laser beam across the scanning field.