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Advances in information optics and photonics
- 2008
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Editorial collection (other academic/artistic)abstract
- This volume is the sixth in a series of books initiated in 1989 by the International Commission for Optics (ICO). These books highlight the advances and trends in the research and development of optical sciences, technologies, and applications at the time of their publication. In this age of the photon, information optics and photonics represent the key technologies to sustain our knowledge-based society. New concepts in classical and quantum-entangled light, coherent interaction with matter, and novel materials and processes have led to remarkable advances in today's information science and technology. The ICO is closely involved with information optics, as exemplified by the ICO topical meeting on Optoinformatics/Information Photonics (St. Petersburg, Russia, 2006), the ICO/ICTP Winter College on Quantum and Classical Aspects of Information Optics (Trieste, Italy, 2006), and the many ICO Prizes recently awarded on outstanding contributions on these topics. This book is in part based on these ICO activities. This volume contains a collection of 32 chapters from internationally leading scientists and research groups on a variety of topics in information optics and photonics, including the 2003-2006 ICO Prize winners. The chapters are divided into 7 sections: Beam Optics; Laser Photonics and Components; Electromagnetic Coherence; Imaging, Microscopy, Holography, and Materials; Photonic Processing; Quantum Information and Matter; and Communications and Networks.
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- Alonso, M. A., et al.
(author)
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Optimal pulses for arbitrary dispersive media
- 2011
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In: Journal of the European Optical Society-Rapid Publications. - : European Optical Society. - 1990-2573. ; 6, s. 11035-
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Journal article (peer-reviewed)abstract
- A variational procedure is given for finding the pulses for which the initial temporal rms width and the rate of increase of this width are jointly minimized for propagation in non-absorbing media with arbitrary dispersive properties. We show that, while in linearly dispersive media the optimal pulses are Gaussian, in other situations such as a hollow metallic waveguide or for purely cubic dispersion departures from Gaussian behavior become evident. An interpretation of the results in terms of suitable phase-space representations is also given.
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- Blomstedt, Kasimir, et al.
(author)
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Arbitrarily short coherence length in wave fields within finite lossless source regions
- 2007
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In: Physical Review E. - 1539-3755. ; 75:2
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Journal article (peer-reviewed)abstract
- We show that it is possible to construct stochastic source distributions that generate wave fields with any desired spatial coherence properties inside a prescribed finite region, regardless of the refractive-index distribution therein. In particular, we demonstrate that there is no universal sinc-function form for the field correlations produced by statistically homogeneous and isotropic source distributions within large lossless regions, contrary to what is suggested by previous work. The results also disprove the commonly held belief that in lossless source regions the coherence length of the light is bounded below by the blackbody coherence length-that is, by approximately half the wavelength of the field.
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- Blomstedt, K., et al.
(author)
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Effect of absorption on the spatial coherence in scalar fields generated by statistically homogeneous and isotropic sources
- 2005
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In: Physical Review E. - 1539-3755. ; 72:5
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Journal article (peer-reviewed)abstract
- We investigate the behavior of the spectral degree of coherence of fluctuating scalar wave fields generated by statistically homogeneous and isotropic sources within absorbing media. In the limit of negligible losses, the degree of coherence is shown to be of a known universal form (sinc function), whereas in the limit of infinite losses it is shown to asymptotically approach the degree of coherence of the source. The intermediate cases are studied for fields produced by sources with Gaussian and sinc-type coherence functions. These studies show that the concept of negligible losses is meaningful only when defined with respect to specific source distribution statistics, and that even for arbitrarily small nonzero losses, the coherence length of the field can be arbitrarily short.
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- Blomstedt, K., et al.
(author)
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Effective degree of coherence : general theory and application to electromagnetic fields
- 2007
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In: Journal of Optics. A, Pure and applied optics. - : IOP Publishing. - 1464-4258 .- 1741-3567. ; 9:10, s. 907-919
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Journal article (peer-reviewed)abstract
- The concept of overall or effective degree of coherence has proven useful and insightful in the scalar theory of light. In this paper we extend the concept to fields represented over arbitrary vector (Hilbert) spaces. We show that the effective degree of coherence remains unaltered by scaled unitary mappings, which describe for instance many physical interactions. In the context of random, vector-valued electromagnetic fields the invariance implies that the effective degree of coherence assumes the same value in commonly used representation spaces. Thereby, in contrast to the local degree of coherence, this quantity can be taken as an intrinsic property of the electromagnetic wave field. In particular, the effective degree of coherence does not change when the field is scattered by a lossless medium and it can be determined from the far-field pattern. Hence the effective degree of coherence of electromagnetic fields is readily measurable.
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- Burvall, Anna, et al.
(author)
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Communication modes applied to axicons
- 2004
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In: Optics Express. - 1094-4087. ; 12:3, s. 377-383
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Journal article (peer-reviewed)abstract
- The communication modes, which constitute a convenient method for the propagation and information analysis of optical fields, are formulated in the generalized axicon geometry. The transmitting region is the axicon’s annular aperture, and the observation domain is the optical axis containing the focal line segment. We show that in rotational symmetry one may employ the prolate spheroidal wave functions to represent the communication modes. Further, in usual circumstances the modes can be approximated by quadratic waves in the aperture domain and by sinc functions in the image domain. Both the exact communication modes and the approximate technique are confirmed numerically, with linear axicons as examples.
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- Burvall, Anna, 1976-, et al.
(author)
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Communication modes for information content analysis
- 2004
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In: LFNM 2004. - : IEEE conference proceedings. - 0780384296 ; , s. 112-114
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Conference paper (other academic/artistic)abstract
- Approximate modes which give physical understanding for the communication modes theory,are discussed. For the geometry consisting of two line or square apertures, perpendicular to the optical axis, this approximation leads to exactly the same modes as Gabor's theory would yield.
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- Burvall, Anna, et al.
(author)
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Communication modes in axicon imaging
- 2004
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In: Riao/Optilas 2004: 5th Iberoamerican Meeting On Optics And 8th Latin American Meeting On Optics, Lasers, And Their Applications, Pts 1-3: Ico Regional Meeting. - : SPIE. - 081945575X ; , s. 1133-1137
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Conference paper (peer-reviewed)abstract
- The communication modes are an increasingly frequently used technique for studying the radiation, propagation, and scattering of light. The method is unusual in the way that it gives the information content and the resolution of the fields. It also allows for the possibility of including the noise considerations in the calculations. We present a brief summary of the communication modes method, together with our latest contribution: the communication modes for the axicon geometry.
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