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The Analytical Calculation of Temperature-Dependent Propagation Constant, V No. and Waveguide Dispersion in Super-Gaussian Diode-Pumped Fiber Lasers

100%
Elahi P., Niakowsari A.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 4
525-527
EN
In this paper, the dependence of some important parameters in fiber lasers such as propagation constant, normalized frequency or V No. and waveguide dispersion with temperature has been investigated analytically. We showed that the thermal effects cannot be neglected in the above parameters especially in middle and high power regime.
2
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The Analytical Solution of Rate Equations in End-Pumped Fiber Lasers with Minimum Approximation and Temperature Distribution during the Laser Operation

100%
Elahi P., Zare N.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 4
522-524
EN
In this paper, as the first the rate equations in end-pumped fiber laser have been solved analytically with minimum approximation and the output power versus input power has been derived. Then, the heat conduction equation in the fiber which is in operation has been solved and the temperature distribution has been derived. The results were applied for a Yb-doped fiber laser and discussed.
3
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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
|
2009
|
vol. 116
|
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.
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
|
2007
|
vol. 112
|
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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