Abstract
We propose the use of two asymmetrical phase masks combined with the subtracted imaging method to enhance the signal-to-noise ratio in wavefront coding systems. This subtracted imaging technique is similar to the variable pinhole diameter in confocal microscopy. Two different phase modulations of same phase masks are employed to promote the magnitude of the optical transfer function (OTF). The ratio factor is used to control the phase variation between two phase masks. The noise of decoded images is suppressed owing to the higher magnitude of the OTF than the wavefront coding systems with a phase mask. A tangent phase mask as an example is used to demonstrate our concept. Simulated results show that the performance promotion controls noise amplification of decoded images while maintaining a depth-of-field extension.
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
Haoyuan Du, Rigui Yi, Liquan Dong, Ming Liu, Wei Jia, Yuejin Zhao, Xiaohua Liu, Mei Hui, Lingqin Kong, and Xi Chen
Appl. Opt. 57(13) 3365-3371 (2018)
L. V. Nhu, Zhigang Fan, Shouqian Chen, and Fanyang Dang
Appl. Opt. 55(26) 7345-7350 (2016)
Van Nhu Le, Zhigang Fan, and Quoc Dung Duong
Appl. Opt. 54(12) 3630-3634 (2015)