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http://dx.doi.org/10.3807/KJOP.2005.16.4.334

Design of Multi-phase Holographic Optical Low-pass Filter for the Improvement of the MTF Characteristics  

Oh, Yong-Ho (Division of Microelectronics and Display Technology, Wonkwang University)
Go, Chun-Soo (Division of Microelectronics and Display Technology, Wonkwang University)
Publication Information
Korean Journal of Optics and Photonics / v.16, no.4, 2005 , pp. 334-339 More about this Journal
Abstract
We studied the spatial filtering characteristics of a multi-phase hologram optical low-pass filter(HOLF). Using the Monte-Carlo based hologram generation program, we designed holograms whose diffraction patterns are circular shaped 21 beams and calculated the diffraction efficiencies and MTFs. 4-phase HOLF have the same diffraction efficiency as that of 2-phase HOLF. The MTF graphs of the two are also nearly alike. But 8-phase HOLF shows higher efficiency than those previously discussed and has larger MTF values in the low frequency region. 16-phase HOLF has just a little better characteristics than 8-phase. Considering the errors which can arise in the process of making holograms, 8-phase HOLF fits the goal of improving the resolution of spatial filter. We also fabricated 8-phase HOLF and .measured MTF The experimental results agree well with the theoretical expectations.
Keywords
Spatial frequency filter; Computer generated hologram; MTF(modulation transfer function); Nyquist frequency;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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