| 摘要 |
A technique for mapping working images to adjacently and continuously tiled subapertures having CGHs on a plate is disclosed with the result that the entirety of a working area of a plate is completely covered with working subapertures, these subapertures usually being rectangular. The design technique thereafter determines a phase function which approximately maps desired regions on each subaperture from portions of the working image in the workpiece plane. Steps in the process include first a determination of the size and shape of subapertures representing each feature. Second, a determination of the geometric transformation for each feature is made. Thereafter, backpropagation or other refinement to create the desired intensity profile at the workpiece is made. Although the techniques for determining the size and shapes of the subapertures can be used separately, or the technique for mapping each working image to is corresponding subaperture can be used separately, combination of all steps is preferred to gain full advantages of simpler, more inexpensive masks and greater potential capability for the ultimately produced subaperture broadcast plate.
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