Zobrazeno 1 - 10
of 194
pro vyhledávání: '"Freund, Isaac A."'
Autor:
Freund, Isaac
Publikováno v:
Scientific American, 2019 Nov 01. 321(5), 6-6.
Externí odkaz:
https://www.jstor.org/stable/27265381
Autor:
Freund, Isaac
Circularly polarized Gauss-Laguerre GL(0,0) and GL(0,1) laser beams that cross at their waists at a small angle are shown to generate a quasi-paraxial field that contains an axial line of circular polarization, a C line, surrounded by polarization el
Externí odkaz:
http://arxiv.org/abs/0910.1663
Autor:
Freund, Isaac
The minor axes of, and the normals to, the polarization ellipses that surround singular lines of linear polarization in three dimensional optical ellipse fields are shown to be organized into Mobius strips and into structures we call rippled rings (r
Externí odkaz:
http://arxiv.org/abs/0905.3364
Autor:
Freund, Isaac
The major and minor axes of the polarization ellipses that surround singular lines of circular polarization in three dimensional optical ellipse fields are shown to be organized into Mobius strips. These strips can have either one or three half-twist
Externí odkaz:
http://arxiv.org/abs/0903.2927
Autor:
Freund, Isaac
M\"{o}bius strips with one, two, three, and four, half-twists are shown to be generic features of three-dimensional (nonparaxial) elliptically polarized light. The geometry and topology of these unusual singularities is described and the multitude of
Externí odkaz:
http://arxiv.org/abs/0812.3263
Autor:
Kessler, David A., Freund, Isaac
We study screening of optical singularities in random optical fields with two widely different length scales. We call the speckle patterns generated by such fields speckled speckle, because the major speckle spots in the pattern are themselves highly
Externí odkaz:
http://arxiv.org/abs/0807.3234
Autor:
Freund, Isaac, Kessler, David A.
Random optical fields with two widely different correlation lengths generate far field speckle spots that are themselves highly speckled. We call such patterns speckled speckle, and study their critical points (singularities and stationary points) us
Externí odkaz:
http://arxiv.org/abs/0806.3656
Autor:
Freund, Isaac, Kessler, David A.
Speckle patterns produced by random optical fields with two (or more) widely different correlation lengths exhibit speckle spots that are themselves highly speckled. Using computer simulations and analytic theory we present results for the point sing
Externí odkaz:
http://arxiv.org/abs/0712.2529
Autor:
Kessler, David A., Freund, Isaac
Screening of topological charges (singularities) is discussed for paraxial optical fields with short and with long range correlations. For short range screening the charge variance in a circular region with radius $R$ grows linearly with $R$, instead
Externí odkaz:
http://arxiv.org/abs/0710.5541
Autor:
Hart, Kevin R., Lankford, Seth M., Freund, Isaac A., Patrick, Jason F., Krull, Brett. P., Wetzel, Eric D., Sottos, Nancy R., White, Scott R.
Publikováno v:
In Composites Science and Technology 20 October 2017 151:1-9