The Degree of Coherence of Radiating Systems and the Directionality of Light Beams.

1976 ◽  
Author(s):  
Emil Wolf
Keyword(s):  
Degree Of Coherence ◽  
Light Beams

New technique for controlling the degree of coherence of two light beams

1992 ◽  
Vol 24 (5) ◽  
pp. 289-291 ◽  
Author(s):  
X.Y. Zou ◽  
L.J. Wang ◽  
T.P. Grayson ◽  
L. Mandel
Keyword(s):  
New Technique ◽  
Degree Of Coherence ◽  
Light Beams

scholarly journals The Detection of Time-correlated Photons by a Coincidence Counter

1959 ◽  
Vol 12 (1) ◽  
pp. 77 ◽  
Author(s):  
RQ Twiss ◽  
AG Little
Keyword(s):  
Light Source ◽  
Reasonable Agreement ◽  
Plasma Oscillations ◽  
Arrival Times ◽  
Degree Of Coherence ◽  
Significant Difference ◽  
Coincidence Counter ◽  
Spurious Effect ◽  
Light Beams ◽  
Theory And Experiment

The existence of a correlation between the arrival times of photons has been confirmed by measurements with a coincidence counter having a resolving time of 3�5 X 10-9 sec in three different experiments. In the first experiment it was found that the number of coincidence counts recorded from two photomultipliers, the apertures of which were optically superimposed, was significantly greater than when the light beams were incoherent. Furthermore, the number of these correlated counts was in satisfactory agreement with that predicted by theory. In the second experiment the change in the number of excess coincidences was measured as the degree of coherence of the light was altered by increasing the apparent separation of the photocathodes, and in this case also there was reasonable agreement between theory and experiment. In the final experiment it was shown that there was a significant difference between the number of coincidences observed when the light beams were in identical as opposed to orthogonal polarizations, and this last result especially makes it extremely improbable that the correlation could be caused by some spurious effect, such as plasma oscillations in the source, since the light source itself was found to be completely unpolarized.

Probing the Electromagnetic Degree of Coherence of Light Beams with Nanoscatterers

ACS Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 1030-1035 ◽  
Author(s):  
Kimmo Saastamoinen ◽  
Henri Partanen ◽  
Ari T. Friberg ◽  
Tero Setälä
Keyword(s):  
Degree Of Coherence ◽  
Light Beams

EPR light beams and non-Gaussian quantum distributions in the time domain

2009 ◽  
Vol 6 (7) ◽  
pp. 577-580
Author(s):  
N. H. Adamyan ◽  
H. H. Adamyan ◽  
G. Yu. Kryuchkyan
Keyword(s):  
Time Domain ◽  
Non Gaussian ◽  
The Time Domain ◽  
Light Beams ◽  
Quantum Distributions

scholarly journals OAM light propagation through tissue

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Netanel Biton ◽  
Judy Kupferman ◽  
Shlomi Arnon
Keyword(s):  
Light Propagation ◽  
Biological Imaging ◽  
Gaussian Beams ◽  
Medical Implants ◽  
Optical Wireless ◽  
Scattering Media ◽  
Valuable Contribution ◽  
Light Beams ◽  
First Time ◽  
Diffuse Media

AbstractA major challenge in use of the optical spectrum for communication and imaging applications is the scattering of light as it passes through diffuse media. Recent studies indicate that light beams with orbital angular momentum (OAM) can penetrate deeper through diffuse media than simple Gaussian beams. To the best knowledge of the authors, in this paper we describe for the first time an experiment examining transmission of OAM beams through biological tissue with thickness of up to a few centimeters, and for OAM modes reaching up to 20. Our results indicate that OAM beams do indeed show a higher transmittance relative to Gaussian beams, and that the greater the OAM, the higher the transmittance also up to 20, Our results extend measured results to highly multi scattering media and indicate that at 2.6 cm tissue thickness for OAM of order 20, we measure nearly 30% more power in comparison to a Gaussian beam. In addition, we develop a mathematical model describing the improved permeability. This work shows that OAM beams can be a valuable contribution to optical wireless communication (OWC) for medical implants, optical biological imaging, as well as recent innovative applications of medical diagnosis.

Surface Media: McLuhan, the Bauhaus and the Tactile Values of TV

2021 ◽  
pp. 1357034X2110089
Author(s):  
Henning Schmidgen
Keyword(s):  
Media Use ◽  
Bruno Latour ◽  
Marshall Mcluhan ◽  
Political Factors ◽  
The Social ◽  
Human Actors ◽  
Sense Of Touch ◽  
Light Beams ◽  
Digital Computers

Marshall McLuhan understood television (TV) as a tactile medium. This understanding implied what Bruno Latour might call a ‘symmetrical’ conception of tactility. According to McLuhan, not only human actors are endowed with the sense of touch. In addition, TV, digital computers and other ‘electric media’ use light beams and similar scanning techniques for ceaselessly ‘caressing the contours’ of their surroundings. This notion of tactility was crucially shaped by the holistic aesthetics of the early Bauhaus. To get at the specific features of the TV image, McLuhan relied on the writings of László Moholy-Nagy and Sigfried Giedion, in particular their use of photography for capturing and highlighting the ‘texture’ of surfaces. However, he hardly reflected the social and political factors that, in the age of electric media, contribute to the ‘symmetricization’ of touch.

scholarly journals Light Confinement with Structured Beams in Gold Nanoparticle Suspensions

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 221
Author(s):  
Argelia Balbuena Balbuena Ortega ◽  
Felix E. Torres-González ◽  
Valentin López López Gayou ◽  
Raul Delgado Delgado Macuil ◽  
Gaetano Assanto ◽  
...  
Keyword(s):  
Colloidal Suspension ◽  
Laser Wavelength ◽  
Gaussian Beams ◽  
Optical Vortices ◽  
Complex Structures ◽  
Plasmonic Resonance ◽  
Dark Solitons ◽  
Experimental Campaign ◽  
Nanoparticle Suspensions ◽  
Light Beams

We carry out an experimental campaign to investigate the nonlinear self-defocusing propagation of singular light beams with various complex structures of phase and intensity in a colloidal suspension of gold nanoparticles with a plasmonic resonance near the laser wavelength (532nm). Studying optical vortices embedded in Gaussian beams, Bessel vortices and Bessel-cosine (necklace) beams, we gather evidence that while intense vortices turn into two-dimensional dark solitons, all structured wavepackets are able to guide a weak Gaussian probe of different wavelength (632.8 nm) along the dark core. The probe confinement also depends on the topological charge of the singular pump.

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