Results 201 to 210 of about 61,034 (237)
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Theory of photoelectric detection of light fluctuations
Proceedings of the Physical Society, 1964The basic formulae governing the fluctuations of counts registered by photoelectric detectors in an optical field are derived. The treatment, which has its origin in Purcell's explanation of the Hanbury Brown-Twiss effect, is shown to apply to any quasi-monochromatic light, whether stationary or not, and whether of thermal origin or not.
L. MANDEL, E.C.G. SUDARSHAN, E. WOLF
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Light fluctuations in the laser
International Laser Science Conference, 1986When the working point of a laser is taken through its threshold of oscillation, the optical field undergoes an order-disorder type of phase transition, which is manifest in the statistics of the emitted light photons, and has been studied experimentally by photoelectric counting and correlation measurements. In a single-mode laser the phase transition
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Universal Conductance Fluctuations of Light
Physical Review Letters, 1998We observed that laser light, multiply scattered through small samples of optically dense colloidal suspensions, builds up anomalous long range correlations in the transmission speckle pattern. The dynamic autocorrelation function of angular integrated light intensity has two contributions, ${C}_{2}(t)$ and ${C}_{3}(t)$, which decay on very different ...
Frank Scheffold, Georg Maret
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Photosynthesis in fluctuating light
2023Light is the essential energy source for plants to drive photosynthesis. In nature, light availability is highly variable and often fluctuates on very short time scales. As a result, plants developed mechanisms to cope with these fluctuations. Understanding how to improve light use efficiency in natural fluctuating light (FL) conditions is a major ...
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Coherence and Fluctuations in Light Beams
American Journal of Physics, 1964A quasithermal, quasmonochromatic lamp is described which serves as a highly degenerate light source with adjustable coherence time between 10−5 sec and 1 sec. This lamp is used for several demonstration experiments concerning the relations between coherence and fluctuations: The intensity interferometer of Hanbury Brown and Twiss is applied to measure
W. Martienssen, E. Spiller
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Photosynthesis in Fluctuating Light Environments
2006The light environment in plant canopies is characterized by rapid fluctuations in photon flux density (PFD) because of the occurrence of sunflecks. These sunflecks can contribute most of the PFD available for photosynthesis and thus the mechanisms that control their utilization can have a significant impact on the carbon gain within canopies or in ...
Robert W. Pearcy +2 more
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Fluctuations of MS births and UV-light exposure
Acta Neurologica Scandinavica, 2012Patients with multiple sclerosis (MS) are more frequently born in spring when compared to autumn. Fluctuation of UV-light has been hypothesized to drive this phenomenon.To assess the correlation between fluctuation of sunlight and birth season in persons with MS.For this record-linkage study, we collected from the international MSBase and the Italian ...
F. Verheul +41 more
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Fluctuations and light scattering in thin smectic films
Physical Review E, 1993An analysis of the layer-displacement fluctuations in thin smectic-A liquid-crystal films is presented. Explicit formulas for the displacement-displacement correlation function, taking into account the surface tension and the anchoring strength, are derived.
, Shalaginov, , Romanov
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Communication with Dynamically Fluctuating States of Light Polarization
Physical Review Letters, 2002The fast, irregular, fluctuations of the state of polarization of light output from an erbium doper fiber ring laser are used to communicate digital information. The experiments illustrate the application of a dynamical encoding and information recovery scheme that is robust to perturbations of the communication channel, a standard single mode fiber. A
Gregory D, VanWiggeren, Rajarshi, Roy
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Rapid intensity fluctuations of light scattered by glasses
Physical Review B, 1987We report the first observation of the fine structure in the angular-dependent intensity of light elastically scattered by a highly transparent sample of chemical-vapor-deposition silica glass. The effect was found to be caused by small, isotropic structure defects, distributed randomly throughout the sample.
, Gillies +4 more
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