An iterative algorithm for multiple incoming wavelengths is proposed t
o design a computer-generated holographic diffuser with the features o
f high light utilization efficiency and uniform color mixing. The ampl
itude transmittance of this computer-generated holographic diffuser is
constant, while the phase transmittance consists of multiple phase le
vels. This diffuser is designed according to the Fraunhofer diffractio
n theory and can uniformly spread the different input light at the sam
e time. The simulation results show that over 88% average far field am
plitude transmission efficiency is achieved for each input light and t
he output uniformity is within 12.4%. (C) 1998 Elsevier Science B.V. A
ll rights reserved.