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

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Published on: July 5, 2016

Low-coherence digital holographic microscope with a Fizeau interferometer.

Mohit Rathor, Shivam Kumar Chaubey, Neha Choudhary

|April 24, 2026

Summary

This summary is machine-generated.

This study introduces a digital holographic microscope (DHM) for clear, quantitative imaging without speckle. The novel setup allows for precise depth sectioning and high-quality phase imaging, useful for various scientific fields.

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Area of Science:

Optics and Photonics
Microscopy Techniques
Image Processing

Background:

Speckle noise is a common artifact in holographic microscopy, degrading image quality and quantitative accuracy.
Traditional digital holographic microscopy (DHM) often struggles with speckle reduction and effective depth sectioning.
Achieving quantitative phase imaging without speckle requires advanced optical configurations and processing methods.

Purpose of the Study:

To develop and validate a novel digital holographic microscope (DHM) capable of speckle-free quantitative imaging.
To implement depth sectioning capabilities within the DHM system.
To demonstrate the system's effectiveness for various applications, including pathology, material science, and metrology.

Main Methods:

An in-line Fizeau interferometer configuration was employed using an incoherent light source.
A tunable longitudinal separation between interfering beams was utilized to control fringe recording within the coherence length.
A polarization-phase shifting approach was used to retrieve quantitative speckle-free phase images from recorded interferograms.

Main Results:

The proposed DHM successfully achieved speckle-free quantitative phase imaging.
Effective depth sectioning capability was demonstrated through the optical configuration.
Experimental validation with smooth and rough objects confirmed the system's high performance, supported by image quality evaluation.

Conclusions:

The developed DHM offers a robust solution for speckle-free quantitative imaging and depth sectioning.
The system's ability to provide high-quality phase images opens new possibilities in microscopic analysis.
Promising applications are identified in pathological imaging, material science, and precision metrology.