Comparison of a grating optical low-pass filter with a birefringent filter

Yong-Ho Oh; Chun-Soo Go; Jai-Cheol Lee; Sungwoo Lim; Shi-Ho Kim

doi:10.1117/12.446573

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29 October 2001 Comparison of a grating optical low-pass filter with a birefringent filter

Yong-Ho Oh, Chun-Soo Go, Jai-Cheol Lee, Sungwoo Lim, Shi-Ho Kim

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Proceedings Volume 4594, Design, Fabrication, and Characterization of Photonic Devices II; (2001) https://doi.org/10.1117/12.446573
Event: International Symposium on Photonics and Applications, 2001, Singapore, Singapore

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.

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Yong-Ho Oh, Chun-Soo Go, Jai-Cheol Lee, Sungwoo Lim, and Shi-Ho Kim "Comparison of a grating optical low-pass filter with a birefringent filter", Proc. SPIE 4594, Design, Fabrication, and Characterization of Photonic Devices II, (29 October 2001); https://doi.org/10.1117/12.446573

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