Open AccessVersatile spectral modulation of a broadband source for digital holographic microscopy
Author(s) -
Gaël Nardin,
Tristan Colomb,
Yves Emery,
Christophe Moser
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.027791
Subject(s) - optics , spatial light modulator , holography , digital holographic microscopy , digital holography , phase modulation , broadband , wavelength , bandwidth (computing) , wavefront , modulation (music) , spatial frequency , pulse shaping , phase (matter) , microscopy , physics , computer science , laser , telecommunications , phase noise , acoustics , quantum mechanics
We demonstrate the potential of spatial light modulators for the spectral control of a broadband source in digital holographic microscopy. Used in a 'pulse-shaping' geometry, the spatial light modulator provides a versatile control over the bandwidth and wavelength of the light source. The control of these properties enables adaptation to various experimental conditions. As a first application, we show that the source bandwidth can be adapted to the off-axis geometry to provide quantitative phase imaging over the whole field of view. As a second application, we generate sequences of appropriate wavelengths for a hierarchical optical phase unwrapping algorithm, which enables the measurement of the topography of high-aspect ratio structures without phase ambiguity. Examples are given with step heights up to 50 µm.