Results 241 to 250 of about 204,940 (296)
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Fundamental limits of optical superresolution
Optics Letters, 1997Increasing the resolving power of optical systems beyond the limits imposed by diffraction, or superresolution, has considerable theoretical as well as practical interest. Several schemes have been proposed to achieve superresolution with reasonable success, but there are no criteria that enable one to determine what improvement can ultimately be ...
T R, Sales, G M, Morris
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Quantum Limits on Optical Resolution
Physical Review Letters, 2000We discuss the ultimate limit imposed by quantum fluctuations of light for resolution of fine details in optical images. For this purpose, we extend in the quantum domain the classical analysis of the object reconstruction, or superresolution, in terms of prolate spheroidal function basis.
, Kolobov, , Fabre
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Applied Optics, 2008
We propose the design of an optical limiter based on a microelectromechanical systems deformable mirror. The design is based on aperturing focused light reflected out of an optically driven deformable mirror, deformed in a parabolic form. We derive an expression for the reflected light intensity, and we show that the reflected light saturates as a ...
Jed, Khoury +4 more
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We propose the design of an optical limiter based on a microelectromechanical systems deformable mirror. The design is based on aperturing focused light reflected out of an optically driven deformable mirror, deformed in a parabolic form. We derive an expression for the reflected light intensity, and we show that the reflected light saturates as a ...
Jed, Khoury +4 more
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Optical limiting for microsecond pulses
The Journal of Chemical Physics, 2009We present a dynamical theory of nonlinear absorption and propagation of laser pulses with duration in the microsecond time domain. The general theory is applied to fullerene C60 because of its good optical limiting properties, namely, a rather low ground state absorption and a strong triplet-triplet absorption.
Sergey, Gavrilyuk +4 more
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Optical shielding of nickel nanoparticle by a bubble: Optical limiting gets limited
Applied Physics Letters, 2016We have demonstrated that in a nickel nanoparticle colloid, the optical limiting action reduces if a vapor bubble forms around the nanoparticle. The energy-dependent transmission and z-scan measurements on nickel nanoparticles in toluene show the onset of an additional process.
Vijay Shukla, J. Jayabalan, Rama Chari
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IEEE Journal of Quantum Electronics, 1985
We have used two-photon absorption, self-defocusing, and optically-induced melting in GaAs to limit 1 μm picosecond pulsed radiation. The contribution to the limiting action from each of these mechanisms is discussed and demonstrated. Additionally, we measure a two-photon absorption coefficient of 26 cm/GW, which is in good agreement with the smallest ...
T. Boggess +4 more
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We have used two-photon absorption, self-defocusing, and optically-induced melting in GaAs to limit 1 μm picosecond pulsed radiation. The contribution to the limiting action from each of these mechanisms is discussed and demonstrated. Additionally, we measure a two-photon absorption coefficient of 26 cm/GW, which is in good agreement with the smallest ...
T. Boggess +4 more
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SPIE Proceedings, 1985
Summary The growth of laser applications in a large number of areas, the emergence of optical information processing, and the prospect of optical computing have lead to a need for various types of optical limiters and switches. One such device, the OPL, is the opticalequivalent of the Zener diode.
M. J. Soileau +2 more
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Summary The growth of laser applications in a large number of areas, the emergence of optical information processing, and the prospect of optical computing have lead to a need for various types of optical limiters and switches. One such device, the OPL, is the opticalequivalent of the Zener diode.
M. J. Soileau +2 more
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Theoretical Limits for the Dispersion Limited Optical Channel
2006In this paper, we study the theoretical limits of optical communication channels affected by chromatic dispersion. By using as a metric the energy transfer ratio, we find the optimal transmitted pulse shape that allows minimizing the impact of dispersion, together with an interesting definition of the dispersive channel equivalent bandwidth. This paper,
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LIMITING PRECISION IN OPTICAL INTERFEROMETRY
Canadian Journal of Physics, 1959The fundamental limit to the precision of setting on a fringe peak due to photon noise is evaluated for a certain class of interferometric methods in terms of parameters characterizing the source, the interferometer, and the detector. It is shown that changes in path difference of 10−10 should be detectable with an observing time of 1 second, using ...
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NANOMATERIALS AS OPTICAL LIMITERS
Journal of Nonlinear Optical Physics & Materials, 2000Optical limiters based on several different classes of nanomaterials are reviewed. The systems under consideration include metal and semiconductor nanoparticles and nanoscale carbon materials. For the latter, the optical limiting properties of carbon nanoparticles, fullerenes, and suspended and solubilized carbon nanotubes are summarized and compared.
YA-PING SUN +3 more
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