Optical computing is a very interesting 60-year old field of research. This paper gives brief historical review the life optical from early days until today. generated lot enthusiasm in sixties with major breakthroughs opening large number perspectives. The period between 1980 and 2000 could be called golden age numerous new technologies innovating processors designed constructed for real applications. Today not ready to die, it has evolved its results benefit research topics such as...

The inherent distortion of a reflective parallel aligned spatial light modulator (SLM) may need compensation not only for the backplane curvature but also other possible nonuniformities caused by thickness variations liquid crystal layer across aperture. First, we build global look-up table (LUT) phase modulation versus addressed gray level whole device Second, when lack uniformity is observed, define grid cells onto SLM aperture and develop multipoint calibration. relative between...

The Hough transform is a powerful feature extraction algorithm transforming parametric curves of objects into smaller space called the parameter domain. Optical implementation by space-variant holographic filters discussed, and computer controlled system for generating such described. Employing this system, images bandwidth product 60 × are generated applied to recognize detect straight lines circles in parallel real time.

Beam-propagation-based phase recovery approaches, also known as retrieval methods, retrieve the amplitude and of arbitrary complex-valued fields. We present experimentally demonstrate a simple robust iterative method using liquid crystal spatial light modulator located at an object diffraction plane. M random masks are applied between image sensor modulator, then patterns collected in Fourier An algorithm these simulating propagation two planes allow us to recover wavefront. The use this...

We propose the optical implementation of diffractive elements onto electrically addressed liquid-crystal spatial light modulators. compare classic implementations amplitude-only or phase-only domains with coupled phase and amplitude (spiral) domains. demonstrate that coupling between provides a trade-off diffraction efficiency signal-to-noise ratio in reconstruction. Furthermore, when investigating influence maximum dephasing on spiral through use optimal design, we show limited can provide...

A computerized optical system has been constructed for the design and generation of space-variant holographic filters. Special considerations filters operation performances are addressed discussed. The was experimentally employed to generate implementations Hough transform, coordinate transformations, etc. Experimental generated evaluated

We propose a new multicriteria method for the determination of computer-generated holograms (CGH's). For this purpose, direct binary search (DBS) algorithm computing CGH's has been modified to converge on error function that defines optimal trade-off among different criteria. This approach allows us control between amplitude and diffraction efficiency provide rigorous figure merit. Comparisons encoding methods show best results are obtained with version DBS combined iterative Fourier...

The speed of most parallel-aligned liquid-crystal-on-silicon (LCoS) spatial light modulators (SLMs) is limited to the video rate their drivers, which a limitation for high-speed applications. However, LCoS SLM presented here has driver allowing frequency range up 1011 Hz. Using static phase modulation characterization and lookup table (LUT), versus shows that can operate at around 130 Hz or even higher small changes 32 extreme changes. A dynamic calibration carried out, we propose method an...

The design, analysis, and feasibility of a novel motionless-head parallel readout optical-disk system are presented. is designed to read data blocks distributed radially on the disk's active surface, it has unique advantage that no mechanical motion head required for fast access, focusing, or tracking. Data access achieved solely through disk rotation, entire memory can be in one rotation. In principle, this permits rate up 1 Gbyte/s. one-dimensional Fourier-transform computer-generated...

Electrically addressed spatial light modulators (SLM) are widely used in optical image processors to display not only input images but also a huge variety of components such as lenses, complex filters and other diffractive elements. These fully programmable dynamically controllable by computer thus bringing flexibility new degrees freedom current digital processors. A good characterization is the most important step SLM initialization. The quality effectiveness component strongly depends on...

We propose a unified approach to the multicriteria design of diffractive optics. A version direct binary search that allows user adjust compromise between diffraction efficiency and signal-to-noise ratio already exists. This technique has proved be extremely powerful but also very time consuming. extend this iterative Fourier transform algorithm, which helps reduce computation dramatically, especially for multilevel domains. Simulations as well experimental validations are provided.

The capacity of optically addressed bistable ferroelectric liquid-crystal spatial light modulators to be used for recording binary computer-generated holograms is experimentally demonstrated. and reconstruction cell- point-oriented are presented.

This paper gives a brief historical review of the development optical computing from early years, 60 years ago, until today. All major inventions in field were made sixties, generating lot enthusiasm. However it is between 1980 and 2000, that had its golden age with numerous new technologies innovating processors been designed constructed for real applications. Today has evolved results benefit to research topics such as nanooptics, biophotonics, or communication systems.

Recently, diffractive optical elements (DOE's) have attracted more attention for applications to third generation PV cells. Some DOE types can provide multiple functions such as spectrum splitting and beam concentration (SSBC) simultaneously. An off-axis lens has been designed its ability achieve the SSBC proved experimentally. This be used separate solar in Vis-NIR range into two bands with a low factor, about 70% efficiency. It is expected that this kind of integrated lateral multijunction...

There is an increasing demand for optical elements having the functionalities of hybrid devices, such as combination a Fresnel lens and diffraction grating. These new devices can be used in many applications, spectrometers, precision measurement systems diffractive enhancing efficiency third generation photovoltaic solar cells. also growing need developments cost-effective technology to fabricate compact devices. Therefore motivation our project find model G-Fresnel (i.e. grating lens)...

We present the characterization of a pure phase reflective liquid crystal spatial light modulator. This modulator is electrically addressed and based on nematic crystal. Its performance in terms frame rate, modulation versus gray level wavefront distortion experimentally evaluated. It shown that after adding compensation applying an appropriate Look-Up-Table, this excellent candidate for applications such as dynamic diffractive optical elements, generation zoom lens.

Imaging polarimetry through evaluation of the degree polarization light can give much information about complex scenes. A classic optical set-up usually consists in using a rotating polarizer or tunable phase modulator as state analyzer. In this study, we implement an imaging polarimeter ferroelectric liquid crystal spatial analyzer able to run at 1000 Hz. This way, our overcome limit 50 Hz, provided that camera is fast enough. Our compared with classical systems which use polarizers.

We present the characterization of a ferro‐electric liquid crystal spatial light modulator and nematic modulator. It is shown that device can be compensated for its phase distortions method proposed increasing frame rate while maintaining maximum modulation 2π. Several applications in information processing are presented with experimental results.

Two methods for reconstructing images are presented: the use of diffractive optical elements displayed on spatial light modulators and digital holography where holograms recorded a camera reconstructed digitally.

Fabrication and testing of a kinoform filter is described, for use in real-time incoherent optical processor designed track recognition high-energy physics experiments. Composition the as mosaic kinoforms with different random diffusers improves quality restoration.