In this paper a new class of optical vortex known as perfect vortex and its generation by means of a liquid crystal spatial light modulator (LC-SLM) is reported. Unlike other techniques, optical vortices with true controllable dark core radius and any topological charge are obtained. Experimental results using LC-SLM model LC2002 Holoeye are shown.
Recently we have reported on the alternative coherent-mode representation of a scalar optical source which does not
involve the solution of the Fredholm integral equation with the source cross-spectral density as a kernel but is based on
results of usual radiometric measurements. Here we generalize such a representation for the case of vector
electromagnetic source. The technique of constructing the proposed representation is illustrated with results of
mathematical simulation.
An experimental technique for controlling the statistical properties of a primary source by means of nematic 90°-twist
liquid-crystal spatial light modulators (LC-SLMs) is proposed. The modulation of coherence and polarization is achieved
through computer generated random signals applied to LC-SLMs placed at the opposite arms of an interferometric setup.
Experimental results obtained by using Holoeye LC2002 modulators show the efficiency of the proposed technique.
KEYWORDS: Radiometry, System on a chip, Americium, Modulators, Coherence (optics), Radio propagation, Wave propagation, Fourier transforms, Superposition, Capillaries
This book provides you with a single source of information on the problem of coherent-mode representations in optics, including new perspectives on its potential applications. In particular, the "light string" and the "light capillary" beams may be advantageously used in communications, measurements, laser microtechnology, and microsurgery; application of the fast algorithm for bilinear transforms can significantly reduce the computer effort needed to simulate optical systems with partially coherent illumination.
The technique of optical generating the light string and light capillary beams predicted recently by authors in a framework of the modal theory of propagation-invariant fields is proposed and its capacity is demonstrated in experiment.
Propagation-invariant fields of the third kind are defined on the base of a modal theory proposed recently by authors. The physical nature of these fields is discussed and their examples are illustrated by the numerical simulation.
The technique of optical generating the light string and light capillary beams predicted recently by authors in a framework of the modal theory of propagation-invariant fields is proposed and its capacity is demonstrated in experiment.
Propagation-invariant fields of the third kind are defined on the base of a modal theory proposed recently by authors. The physical nature of these fields is discussed and their examples are illustrated by numerical simulation.
The process of image formation in optical systems with partially coherent illumination is represented as a superposition of completely coherent modal images. Two modal representations of a partially coherent imaging system are given. The basic concepts are illustrated by an example of calculating the image intensity distribution.
Two rather simple techniques of generating the non diffractive fields by tunable interference interaction of the off-axis zero-order Bessel beams are proposed. Experimental results for illumination of an annular aperture with cosine wave and with optical field which exhibits the self-imaging phenomenon are given.
The general coherent-mode structure of the propagation- invariant field is found as the solution of the differential equation for propagation of the coherent modes of the field. It is shown that three different kinds of the propagation- invariant fields exist. Examples of propagation-invariant fields of different kinds are considered.
The process of image formation in optical systems with partially coherent illumination is represented as a superposition of completely coherent modal image. Two modal representations of a partially coherent imaging system are given.
It is shown that the problem of classification of images that have the perfectly random nature may be solved with the help of synthetic discriminant functions being synthesized by least-squares technique to separate linearly the power spectra of the corresponding random image fields. The realization of the proposed method by means of an optical technique is discussed, and its efficiency is illustrated by two examples of real-life texture classification.
The fast algorithm for calculating the bilinear transform in the optical system is proposed. This algorithm is based on the coherent-mode representation of the cross-spectral density function of the illumination. The algorithm is computationally efficient when the illumination is partially coherent. Numerical examples are studied and compared with the theoretical results.
Potential possibilities are considered and advantages of utilization of magneto-optical spatial- time light modulators for entering the electric signals into the optical data processing system have been shown. The constructions of magneto-optical spatial-time light modulators and original configurations of the optical data processing system which are based on it have been described. The examples of these optical data processing systems have been given.
Utilization of magneto-optical spacing light modulators based on Bi-substituted monocrystalline ferrite-garnet films for spatially distributed magnetic field measurements is discussed. Numerous variants of magnetic field topographical survey for different types (audio & video ...) of magnetic signalogramms geometrical parameters control are described. Special usages for magnetic signalogramms criminalistics examination and faint amplitude signalogramms visualization are described too.
Basic physical characteristics of Bi-ferrogarnet single-crystal films as a perspective material for creation of spatial-time light modulators have been considered. Potentially attainable characteristics of modulators on the basis of this media have been analyzed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.