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

Rotating asymmetrical phase mask method for improving signal-to-noise ratio in wavefront coding systems

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)

Extending depth of field for hybrid imaging systems via the use of both dark and dot point spread functions

L. V. Nhu, Zhigang Fan, Shouqian Chen, and Fanyang Dang
Appl. Opt. 55(26) 7345-7350 (2016)

To extend the depth of field by using the asymmetrical phase mask and its conjugation phase mask in wavefront coding imaging systems

Van Nhu Le, Zhigang Fan, and Quoc Dung Duong
Appl. Opt. 54(12) 3630-3634 (2015)

Nonaxial Strehl ratio of wavefront coding systems with a cubic phase mask

Shouqian Chen, Zhigang Fan, Hong Chang, and Zhigao Xu
Appl. Opt. 50(19) 3337-3345 (2011)

Enhancing form factor and light collection of multiplex imaging systems by using a cubic phase mask

Manjunath Somayaji and Marc P. Christensen
Appl. Opt. 45(13) 2911-2923 (2006)