Scientific Results

Widefield quantitative phase imaging by
second-harmonic dispersion interferometry

Year: 2020

Authors: Brandi F., Wessel F.

Autors Affiliation: L-Egant Solutions, LLC, P.O. Box 16475, Irvine, California 92623, USA

Intense Laser Irradiation Laboratory, Istituto Nazionale di Ottica-Consiglio Nazionale delle Ricerche, Via Moruzzi 1, 56124 Pisa, Italy

Abstract: Widefield optical characterization of transparent samples
is of great importance for gas flow and plasma diagnos-
tics, for example, as well as label-free imaging of biological
samples. An optically transparent medium, however, can-
not be imaged by techniques based on intensity contrast
imaging. Very well-known qualitative phase-contrast imag-
ing methodologies are routinely used to overcome this
limitation, and quantitative phase-imaging approaches
have also been developed. Here we report the demonstra-
tion of, to the best of our knowledge, a novel widefield
quantitative phase-imaging technique, based on fully
common-path second-harmonic dispersion interfer-
ometry that is combined with pixel-by-pixel homodyne
dual-channel polarization-dependent phase detection.
The device is tested in a harsh environment reaching sub-
10 mrad harmonic phase dispersion sensitivity and a spatial
resolution of several tens of microns with an optical configu-
ration that is very stable and easy to implement. The time
resolution of the demonstrated device is 600 ps, set by the
laser-pulse time duration.

Journal/Review: OPTICS LETTERS

Volume: 45      Pages from: 4304  to: 4307

KeyWords: quantitative phase imaging, interferometery
DOI: 10.1364/OL.395097

Citations: 1
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