 Issue 20 Page 3531 Applied OpticsFabrication of multilevel phase computer-generated hologram elements based on effective medium theory Wanji Yu, Koji Takahara, Tsuyoshi Konishi, Tsutom Yotsuya, and Yoshiki IchiokaAuthor Affiliations Wanji Yu, Koji Takahara, Tsuyoshi Konishi, Tsutom Yotsuya, and Yoshiki Ichioka W. Yu K. Takahara, and T. Yotsuya are with the Factory for Advanced Optical Technology, Osaka Science and Technology Center, 2-7-1, Ayumino, Izumi, Osaka 594-1157, Japan.Find other works by these authors W Yu K Takahara T Konishi T Yotsuya Y Ichioka Applied Opticsdoi: 10.1364AO.39.003531Original Manuscript: November 16, 1999 Published: July 10, 2000 Not Accessible 