Implementation of off-axis digital holography using a single diffraction grating

Byoungho Lee; Byounghyo Lee

doi:10.1117/12.2501446

6 November 2018 Implementation of off-axis digital holography using a single diffraction grating

Byoungho Lee, Byounghyo Lee

Proceedings Volume 10818, Holography, Diffractive Optics, and Applications VIII; 1081826 (2018) https://doi.org/10.1117/12.2501446
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

This paper proposes a method for implementing off-axis reflective digital holography using a single diffraction grating element. The typical off-axis digital holography uses a beam splitter to form interference beams, and obtain off-axis interference patterns by tilting a mirror. We use a diffraction grating to replace the mirror and beam splitter with one element. The grating element separates the incident beam into +1 and -1 orders, and the separated beams are used as the reference beam and the signal beam, respectively. The signal beam reflects off the tilted specimen and returns to the grating element. The diffraction grating acts as a beam combiner to diffract the tilted signal beam again to interfere the signal beam with the reference beam. Therefore, the diffraction grating device acts as a multi-functional device that simultaneously performs the functions of the beam splitter and mirror. We set the image sensor plane at an angle perpendicular to the tilted signal beam. As a result, the reference beam can be incident on the image sensor plane in the form of off-axis. Since the two devices required in the conventional off-axis digital holography can be implemented as a single grating component, a cost effective and compact system can be realized.

Citation Download Citation

Byoungho Lee and Byounghyo Lee "Implementation of off-axis digital holography using a single diffraction grating", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 1081826 (6 November 2018); https://doi.org/10.1117/12.2501446

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KEYWORDS

Diffraction gratings

Holograms

Image sensors

Beam splitters

Digital holography

Multiplexing

Mirrors

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