Three-dimensional microscopy and measurement by phase-shifting digital holography

Ichirou Yamaguchi

doi:10.1117/12.455184

5 February 2002 Three-dimensional microscopy and measurement by phase-shifting digital holography

Ichirou Yamaguchi

Proceedings Volume 4607, Selected Papers from Fifth International Conference on Correlation Optics; (2002) https://doi.org/10.1117/12.455184
Event: Fifth International Conference on Correlation Optics, 2001, Chernivsti, Ukraine

Abstract

Digital holography means hologram recording by a CCD and image reconstruction by a computer. The conventional off- axis setup has limitations arising from much lower resolution of CCD than photographic materials. In phase- shifting digital holography employing an in-line setup complex amplitude at a CCD plane is directly detected by stepwise phase-shifting of the reference beam. The complex amplitude is then subject to Fresnel transformation to deliver complex amplitude in three-dimensional space. This method suppresses the zero-th and conjugate images completely and provides high quality of reconstructed images. In this paper basic procedure of the phase-shifting digital holography is first described. Then its applications to 3-dimensional microscopy is reported that is capable of numerical focusing and direct phase observation. Without any imaging lens we can attain resolution of a few micrometers. The second application is concerned with measurement of surface shape that takes the difference of phase distributions reconstructed from different incident angles of the object illuminating beam. This method has the same sensitivity as the conventional fringe projection but the evaluation is simpler and can also be used for deeper and smaller objects. Finally issues for practical applications are discussed.

Citation Download Citation

Ichirou Yamaguchi "Three-dimensional microscopy and measurement by phase-shifting digital holography", Proc. SPIE 4607, Selected Papers from Fifth International Conference on Correlation Optics, (5 February 2002); https://doi.org/10.1117/12.455184

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