Optical device and optical machining system using the optical device

Claim 1

An optical device for reproducing an original image pattern on a subject material, the original image pattern being represented by original image pattern data, the optical device, comprising: a coherent light source that emits a light having a wavefront; rewritable spatial light modulation means for controlling the wavefront of the light emitted from said light source to produce a plurality of image patterns on the subject material for reproducing the original image; and electric processing means for generating a plurality of computer hologram data groups and for sequentially supplying the computer hologram data groups to said rewritable spatial light modulation means, said electric processing means including: means for receiving and storing the original image pattern data, means for generating a plurality of random phase distribution data groups, means for multiplying the original image pattern data by each group of the random phase distribution data to produce, respectively, a plurality of data sets, and means for converting the plurality of data sets produced from said multiplying means to a plurality of computer hologram data groups, respectively, with each computer hologram data group representing one image frame; wherein the random phase distribution data groups are statistically uncorrelated one another; wherein said electric processing means supplies the plurality of computer hologram data groups to said rewritable spatial light modulation means on a group-by-group basis, so that the image frames as represented by the computer hologram data groups are supplied to said rewritable spatial light modulation means on a frame-by-frame basis; wherein said rewritable spatial light modulation means produces and projects an image pattern on the subject material on a pattern-by-pattern basis for each computer hologram data group received from said electric processing means, so that a plurality of image patterns are projected in a series manner and are superposed and integrated at a substantially same location on the subject material to reproduce the original image pattern.