Noise and aliases in off-axis and phase-shifting holography

TL;DR

This paper compares off-axis and phase-shifting holography in terms of noise and alias removal, emphasizing the importance of removing local oscillator beam noise, especially at low illumination levels.

Contribution

It provides a comparative analysis of off-axis and phase-shifting holography focusing on noise and alias suppression techniques.

Findings

Removing LO beam noise is crucial at low illumination levels.

Both methods have different efficiencies in noise and alias removal.

Analysis based on holograms of a USAF target under laser illumination.

Abstract

We have compared the respective efficiencies of off-axis and phase-shifting holography in terms of noise and aliases removal. The comparison is made by analyzing holograms of an USAF target backlit with laser illumination, recorded with a charge-coupled device camera. We show that it is essential to remove the LO beam noise, especially at low illumination levels.