Incoherent digital holographic spectral imaging with high accuracy of image pixel registration

• Published in: Chinese physics B Vol. 30; no. 4; pp. 44202 - 278
• Main Authors: Ma, Feng-Ying, Wang, Xi, Bu, Yuan-Zhuang, Tian, Yong-Zhi, Du, Yanli, Gong, Qiao-Xia, Zhuang, Ceyun, Li, Jinhai, Li, Lei
• Format: Journal Article
• Language: English
• Published: School of Physics and Microelectronics,Key Laboratory of Materials Physics of the Ministry of Education,Zhengzhou University,Zhengzhou 450001,China%School of Mechanical Engineering,Zhengzhou University,Zhengzhou 450001,China 01.04.2021
• Subjects: microspectral imag-ing; spectral imaging; high-precision registration; incoherent digital holography
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/abd2aa

Fresnel incoherent correlation holography (FINCH) is a unique three-dimensional (3D) imaging technique which has the advantages of scanning-free, high resolution, and easy matching with existing mature optical systems. In this article, an incoherent digital holographic spectral imaging method with high accuracy of spectral reconstruction based on liquid crystal tunable filter (LCTF) and FINCH is proposed. Using the programmable characteristics of spatial light modulator (SLM), a series of phase masks, none of whose focal lengths changes with wavelength, is designed and made. For each wavelength of LCTF output, SLM calls three phase masks with different phase constants at the corresponding wavelength, and CCD records three holograms. The spectral images obtained by this method have a constant magnification, which can achieve pixel-level image registration, restrain image registration errors, and improve spectral reconstruction accuracy. The results show that this method can not only obtain the 3D spatial information and spectral information of the object simultaneously, but also have high accuracy of spectral reconstruction and excellent color reproducibility.