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1
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Investigation of Band Gap Width in Ternary 1D Photonic Crystal with Left-Handed Layer

100%
Zare Z., Gharaati A.
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vol. 125
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issue 1
36-38
EN
In this paper, we investigate the variation of band gap width in a ternary 1D photonic crystal with a left-handed layer versus variation of thicknesses and refractive index of second layers. We study these variations in two states, normal and oblique incidents for both TE and TM polarizations. We observe that the variations of band gap width versus thickness of layers are sensitive to the refractive index of second layers. For oblique incident both of variations are shifted towards the large/small frequencies by increasing the incident angles in TE/TM polarization, respectively.
2
Content available remote

Calculation of Temperature Distribution in Eccentric Multi Core Diode Pumped Fiber Lasers by Green Function Method

81%
Gharaati A., Elahi P., Jafari M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
566-569
EN
In this paper, the temperature distribution in fiber lasers pumped by multi diode bars located in out-of-fiber axis has been investigated semi-analytically. For this reason, we consider heat deposition in fiber lasers due to pump and the nonhomogeneous heat conduction equation has been solved by using Green function method in a cylindrical coordinate system. Our model has been used for single, double and multi pumped configuration and, for a typical fiber lasers, the results have been plotted and discussed.
3
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Calculation of Anderson Localization Length by Using Generalized Quantum Kicked Rotator Analytically

81%
Gharaati A., Bahadori F., Boroumandi H.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
30-32
EN
We use the generalized quantum kicked rotator model and its relation with the Anderson model. We calculate localization length analytically. For this reason, we consider a one-dimensional rotator model for a special potential whose an impulse is applied at equal time intervals, T. We obtain time evolution of the wave function between two successive impulses by an evolution matrix. We change this model to the tight-binding model for a particle on a one-dimensional lattice. At special case the wave function is localized, and then we derive the Anderson localization length for the system analytically.
4
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Propagation of Spatial Solitons with Nonlinear Kerr Effect in Thermal Medium

81%
Gharaati A., Elahi P., Cari S.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
891-896
EN
In this paper, the propagation and behavior of spatial solitons of inhomogeneous nonlinear Schrödinger equation in thermal medium will be investigated analytically. The theoretical model is established by considering the change of refractive index of medium due to heat deposition of entrance beam. The soliton like solution in such thermal medium was derived. The effect of input pump power and beam radius on the behavior of solitons will be studied finally.
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