950 research outputs found
Reconstruction of computer generated holograms by spatial light modulators
Computer generated holograms generated by using three different numerical techniques are reconstructed optically by spatial light modulators. Liquid crystal spatial light modulators (SLM) on transmission and on reflection modes with different resolutions were investigated. A good match between numerical simulation and optically reconstructed holograms on both SLMs was observed. The resolution of the optically reconstructed images was comparable to the resolution of the SLMs. © Springer-Verlag Berlin Heidelberg 2006
Detection of Bessel beams with digital axicons
We propose a simple method for the detection of Bessel beams with arbitrary
radial and azimuthal indices, and then demonstrate it in an all-digital setup
with a spatial light modulator. We confirm that the fidelity of the detection
method is very high, with modal cross-talk below 5%, even for high orbital
angular momentum carrying fields with long propagation ranges. To illustrate
the versatility of the approach we use it to observe the modal spectrum changes
during the self-reconstruction process of Bessel beams after encountering an
obstruction, as well as to characterize modal distortions of Bessel beams
propagating through atmospheric turbulence
Design strategies for optimizing holographic optical tweezers setups
We provide a detailed account of the construction of a system of holographic
optical tweezers. While much information is available on the design, alignment
and calibration of other optical trapping configurations, those based on
holography are relatively poorly described. Inclusion of a spatial light
modulator in the setup gives rise to particular design trade-offs and
constraints, and the system benefits from specific optimization strategies,
which we discuss.Comment: 16 pages, 15 figure
Comparison of beam generation techniques using a phase only spatial light modulator
Whether in art or for QR codes, images have proven to be
both powerful and efficient carriers of information. Spatial light modulators
allow an unprecedented level of control over the generation of optical fields
by using digital holograms. There is no unique way of obtaining a desired
light pattern however, leaving many competing methods for hologram
generation. In this paper, we test six hologram generation techniques
in the creation of a variety of modes as well as a photographic image:
rating the methods according to obtained mode quality and power. All
techniques compensate for a non-uniform mode profile of the input laser
and incorporate amplitude scaling. We find that all methods perform well
and stress the importance of appropriate spatial filtering. We expect these
results to be of interest to those working in the contexts of microscopy,
optical trapping or quantum image creation
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