Method and apparatus for adjusting spot size of one color component of a multiple color co-axial laser beam

摘要

A method of adjusting a first spot size for a first color component (74) of a multiple color co-axial laser beam (70) that comprises, focusing the multiple color co-axial laser beam (70). Filtering the multiple color co-axial laser beam (70) with a filter (50) to adjust the first spot size. The filter (50) is opaque to the first color component (74) in an annular region (62) and transparent to the first color component (74) in a center region (60) of the multiple color co-axial laser beam (70). The filter (50) is transparent to a second color component (76) of the multiple color co-axial laser beam (70) in both the center region (60) and the annular region (62).