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Proceedings Paper

Comparison of a grating optical low-pass filter with a birefringent filter
Author(s): Yong-Ho Oh; Chun-Soo Go; Jai-Cheol Lee; Sungwoo Lim; Shi-Ho Kim
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Paper Abstract

The characteristic of 2D grating optical low-pass filter (GOLF) was compared to that of birefringent low-pass filter (BLF). The modulation transfer function (MTF) of the optical system that consists of lens and GOLF is theoretically derived by taking all orders of diffracted beams into consideration. MTF of a 2 phase chess-board type GOLF and a 3-phase GOLF was compared to that of BLF. The 3 phase GOLF with 9 center beams of equal strength has the best filtering characteristic, and thus removes most moire fringe, but resolution degradation is severe compared to BLF. The two- phase GOLF with phase difference of 180 degrees that is similar to BLF in terms of beam distribution has medium characteristic of 3-phase GOLF and BLF. And, 3 phase GOLF of phase difference of 90 degrees has similar characteristics, too. These three GOLF's are made and experimented by attaching them to a digital camera. The experimental result coincides with the theoretical development.

Paper Details

Date Published: 29 October 2001
PDF: 9 pages
Proc. SPIE 4594, Design, Fabrication, and Characterization of Photonic Devices II, (29 October 2001); doi: 10.1117/12.446573
Show Author Affiliations
Yong-Ho Oh, Wonkwang Univ. (South Korea)
Chun-Soo Go, Wonkwang Univ. (South Korea)
Jai-Cheol Lee, Wonkwang Univ. (South Korea)
Sungwoo Lim, Wonkwang Univ. (South Korea)
Shi-Ho Kim, Wonkwang Univ. (South Korea)

Published in SPIE Proceedings Vol. 4594:
Design, Fabrication, and Characterization of Photonic Devices II
Marek Osinski; Soo-Jin Chua; Akira Ishibashi, Editor(s)

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