scholarly journals Stabilization of optical vortices in noninstantaneous self-focusing medium by small rotating intensity modulation

2007 ◽  
Vol 15 (21) ◽  
pp. 13689 ◽  
Author(s):  
Shiuan-Yeh Chen ◽  
Tzu-Chun Lo ◽  
Ming-Feng Shih
Keyword(s):  
Intensity Modulation ◽  
Optical Vortices ◽  
Self Focusing

scholarly journals Partially incoherent optical vortices in self-focusing nonlinear media

2004 ◽  
Author(s):  
Chien-Chung Jeng ◽  
Ming-Feng Shih ◽  
Kristian Motzek ◽  
Yuri S. Kivshar
Keyword(s):  
Optical Vortices ◽  
Nonlinear Media ◽  
Self Focusing

On the cubic and cubic-quintic optical vortices equations

2016 ◽  
Vol 22 (2) ◽  
Author(s):  
Carlo Greco
Keyword(s):  
Electromagnetic Field ◽  
Light Beam ◽  
Optical Field ◽  
The Self ◽  
Optical Vortices ◽  
Cubic Nonlinearity ◽  
Various Boundary Conditions ◽  
Self Focusing ◽  
Ring Shaped Structure ◽  
Point Type

AbstractAn optical vortex can appear when a light beam with nonzero angular momentum propagates in a suitable nonlinear medium. In some situations has been observed that the light intensity vanish at the center of the vortex (where the phase of the electromagnetic field is undefined), while the light beam assumes a ring-shaped structure. In this paper we consider two classical cases in which such kind of phenomena occur: the case of the self focusing cubic nonlinearity, and the case of competing quintic and cubic nonlinearity. In both cases we study the nonlinear Schrödinger equation of the optical field (with various boundary conditions) by means of min-max methods, and we prove the existence of saddle point type solutions, as well as minimum type solutions.

Self-Focusing of Ultraintense Femtosecond Optical Vortices in Air

2013 ◽  
Vol 111 (2) ◽  
Author(s):  
P. Polynkin ◽  
C. Ament ◽  
J. V. Moloney
Keyword(s):  
Optical Vortices ◽  
Self Focusing

Optical vortices in self-focusing Kerr nonlinear media

2009 ◽  
Vol 282 (16) ◽  
pp. 3349-3355 ◽  
Author(s):  
Peter Hansinger ◽  
Alexander Dreischuh ◽  
Gerhard G. Paulus
Keyword(s):  
Optical Vortices ◽  
Nonlinear Media ◽  
Self Focusing ◽  
Kerr Nonlinear Media

Evolution of Off-Site First-Order Optical Vortices in Optically Induced Self-Focusing Square-Like Photonic Lattices

2016 ◽  
Vol 53 (7) ◽  
pp. 071901
Author(s):  
覃亚丽 Qin Yali ◽  
杨斌 Yang Bin ◽  
余文愫 Yu Wensu ◽  
薛林林 Xue Linlin ◽  
施朝霞 Shi Zhaoxia ◽  
...  
Keyword(s):  
Optical Vortices ◽  
First Order ◽  
Photonic Lattices ◽  
Self Focusing ◽  
Optically Induced

scholarly journals Partially Incoherent Optical Vortices in Self-Focusing Nonlinear Media

2004 ◽  
Vol 92 (4) ◽  
Author(s):  
Chien-Chung Jeng ◽  
Ming-Feng Shih ◽  
Kristian Motzek ◽  
Yuri Kivshar
Keyword(s):  
Optical Vortices ◽  
Nonlinear Media ◽  
Self Focusing

Birth, Evolution and Annihilation of Phase Singularities in the Propagation of a Laser Beam Passed Through a Self-Focusing Strontium Barium Niobate Crystal

1997 ◽  
Vol 06 (02) ◽  
pp. 169-180 ◽  
Author(s):  
A. V. Ilyenkov ◽  
L. V. Kreminskaya ◽  
M. S. Soskin ◽  
M. V. Vasnetsov
Keyword(s):  
Laser Beam ◽  
Wave Front ◽  
Free Space ◽  
Topological Charge ◽  
Optical Vortices ◽  
Strontium Barium Niobate ◽  
Strontium Barium ◽  
Self Focusing ◽  
Phase Singularities ◽  
Edge Dislocations

We report the first observations and the mechanism of natural nucleation, propagation and annihilation of optical vortices in a laser beam with initially smooth Gaussian wave front passed through self-focusing photorefractive strontium barium niobate crystal. Wave-front distortions due to the formation of thermal-induced nonlinear lens lead to the origin of phase singularities. Pairs of opposite topological charge screw wave-front dislocations nucleate and annihilate through a formation of limited edge dislocations. In a free-space propagation the alternating sign vortices array nested in the beam has the form of quadruple.

Analogue intensity modulation schemes for optical fibre HDTV transmission

1993 ◽  
Vol 140 (6) ◽  
pp. 417
Author(s):  
J.M. Senior ◽  
D.T. Lambert ◽  
D.W. Faulkner
Keyword(s):  
Optical Fibre ◽  
Intensity Modulation ◽  
Modulation Schemes
Sign in / Sign up

Export Citation Format

Share Document