Coherent diffraction imaging using structured phase modulation

Rujia Li; Liangcai Cao

doi:10.1117/12.2602333

15 October 2021 Coherent diffraction imaging using structured phase modulation

Rujia Li, Liangcai Cao

Proceedings Volume 11898, Holography, Diffractive Optics, and Applications XI; 118980P (2021) https://doi.org/10.1117/12.2602333
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Abstract

Coherent diffraction imaging (CDI) is a kind of computational technique seeking to reconstruct a complex wavefront from the measured intensity. To solve the phase retrieval problem, phase modulation is introduced to be a physical constraint. In this work, the alternative structured phase modulation (ASPM) and orbital angular momentum (OAM) are used to be the physical constraints. The ASPM can act as the phase grating. The modulated intensities are concentrated, which can be captured with a high signal-to-noise ratio (SNR). OAM is recently employed as a type of reliable modulation. The topological charge is robust during propagating in the atmosphere. The maximum value of the spectrum intensity is reduced by a factor of 170 under OAM modulation when topological charge is 50. The stagnation can be avoided using multiple ASPM and OAM modulations. The complex wavefront can be robustly reconstructed from redundant measurements without a priori knowledge.

Conference Presentation

Citation Download Citation

Rujia Li and Liangcai Cao "Coherent diffraction imaging using structured phase modulation", Proc. SPIE 11898, Holography, Diffractive Optics, and Applications XI, 118980P (15 October 2021); https://doi.org/10.1117/12.2602333

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