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Updated: Nov 19, 2025

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Published on: July 5, 2016

Two-step phase-shifting interferometry for self-interference digital holography.

Tatsuki Tahara, Yuichi Kozawa, Ayumi Ishii

|February 2, 2021

Summary

This summary is machine-generated.

This study introduces a novel phase-shifting interferometry method using just two holograms, simplifying measurements without extra steps. This technique advances digital holographic microscopy and multicolor fluorescence imaging.

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Area of Science:

Optics and Photonics
Digital Holography
Interferometry

Background:

Phase-shifting interferometry is crucial for precise optical measurements.
Self-interference digital holography offers a compact and robust approach to holography.
Existing methods often require multiple recordings or complex estimations.

Purpose of the Study:

To develop a simplified phase-shifting interferometry technique for digital holography.
To eliminate the need for additional recordings or estimations in holographic measurements.
To demonstrate the technique's applicability in advanced imaging modalities.

Main Methods:

A novel phase-shifting interferometry technique is proposed.
The method utilizes only two in-line phase-shifted self-interference holograms.
A mathematical model for self-interference digital holography is adopted.

Main Results:

The technique eliminates the need for additional recording or estimation steps.
Experimental validation was performed on incoherent digital holographic microscopy.
Successful demonstration of color-multiplexed fluorescence digital holography with computational coherent superposition.
First-time realization of two-color-multiplexed four-step phase-shifting incoherent digital holography.

Conclusions:

The proposed technique offers a simplified and efficient approach to phase-shifting interferometry in digital holography.
It enables advanced holographic imaging applications, including multicolor fluorescence microscopy.
This work represents a significant advancement in the field of digital holographic techniques.