A modified input-output (MIO) algorithm for the synthesis of computer-
generated holograms is presented. The MIO algorithm corresponds to th
input-output (IO) algorithm with a special adaptive gain Experimental
results indicate that significant improvement is achievable with the M
IO algorithm due to convergence to a very deep minimum. In the case of
designing quantized phase holograms, no matter how many levels of pha
se quantization are used, the MIO algorithm performs much better than
the IO algorithm.