R. Tudela, E. Martín-Badosa, I. Labastida, S. Vallmitjana, I. Juvells, and A. Carnicer (Spain)
Holographic imaging, full complex modulation, liquid crystal devices, Fresnel holography.
We propose an implementation to display full complex
information using two analogue ferroelectric liquid
crystal spatial light modulators. These can work either
in real-only or imaginary-only configurations. Thus, by
splitting any complex function into its real and
imaginary components and displaying them on two
modulators, full complex modulation can be achieved
by adding both distributions. As an example, we have
computed Fresnel holograms in order to recover an
object at a certain distance from the plane where the
hologram is displayed. We have both performed some
simulations taking into account the specifications of the
modulators and carried out some optical experiments.
The set-up makes use of the two panels and a polarizing
beam-splitter to achieve the addition of the information
displayed on each of them. The experimental results are
in good agreement with simulations taking into account
the limitations of the optical elements.