Seyyed Hossein Asadpour | University of Guilan (original) (raw)

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Papers by Seyyed Hossein Asadpour

Research paper thumbnail of Polarization dependence of optical bistability in the presence of external magnetic field

Research paper thumbnail of Optical properties of double cascade-type GaAs/AlGaAs multiple quantum well nanostructures via exciton spin relaxation

Research paper thumbnail of Transient absorption–dispersion properties of four-level atomic system via elliptically polarized probe light and magnetic field

Research paper thumbnail of Laser polarization dependent and magnetically control of group velocity in a dielectric medium doped with nanodiamond nitrogen vacancy centers

Research paper thumbnail of Optical bistability and multistability via biexciton coherence in semiconductor quantum well nanostructure

Research paper thumbnail of Subluminal and superluminal pulse propagation via spin coherence in a defect dielectric medium

Research paper thumbnail of Phase control of optical bistability based biexciton coherence in a quantum dot nanostructure

North-Holland, Jan 5, 2014

Research paper thumbnail of Switching from optical bistability to multistability via terahertz signal radiation in a InGaN/GaN quantum dot nanostructure

North-Holland, Jun 15, 2014

Research paper thumbnail of Enhanced Kerr Nonlinearity in a Four-Level EIT Medium

Journal of Nonlinear Optical Physics & Materials, 2010

The linear and nonlinear response of a four-level EIT system driven by three coherent fields is i... more The linear and nonlinear response of a four-level EIT system driven by three coherent fields is investigated. It is found that at appropriate atomic parameters, the Kerr nonlinearity can clearly be enhanced. It is also demonstrated that the maximal Kerr nonlinearity enters the EIT window, and the corresponding linear and nonlinear absorption suppress. Moreover, we show that nonlinear absorption and Kerr nonlinearity can also be changed via relative phase between driving fields.

Research paper thumbnail of Optical bistability via quantum interference from incoherent pumping and spontaneous emission

Journal of Luminescence, 2011

We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system c... more We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system confined in a unidirectional ring cavity via incoherent pumping field. It is shown that the threshold of optical bistability can be controlled by the rate of an incoherent pumping field and by interference mechanism arising from the spontaneous emission and incoherent pumping field. We demonstrate that the optical bistability converts to optical multi-stability (OM) by the quantum interference mechanism.

Research paper thumbnail of Lasing without population inversion in an Er-doped YAG crystal

Journal of Modern Optics, 2011

Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.

Research paper thumbnail of Enhancement of Kerr nonlinearity at long wavelength in a quantum dot nanostructure

Physica E-low-dimensional Systems & Nanostructures, 2011

The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum ... more The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum dot by employing the tunnel coupling is investigated. It is shown that by enhancement of tunnel coupling value the Kerr nonlinearity increases and at the same time linear and nonlinear absorption reduces at the long wavelength which is very important for communicational applications. Enhanced of Kerr nonlinearity in a double quantum dots is investigated. It is found that the electron tunneling has an essential role to reducing the linear absorption and increasing the Kerr nonlinearity at long wavelength.

Research paper thumbnail of Lasing without population inversion in an Er-doped YAG crystal

Journal of Modern Optics, 2012

Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.

Research paper thumbnail of Controlling the optical bistability via quantum interference in a four-level N-type atomic system

Journal of Luminescence, 2011

We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-ty... more We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-type atomic system. The effect of spontaneously generated coherence (SGC) on OB and OM is then discussed. It is found that SGC makes the medium phase dependent, so the optical bistability and multi-stability threshold can be controlled via relative phase between applied fields. We realize that the frequency detuning of probe and coupling fields with the corresponding atomic transition plays an important role in creation OB and OM. Moreover, the effect of laser coupling fields and an incoherent pumping field on reduction of OB and OM threshold is then discussed.

Research paper thumbnail of Enhanced Kerr nonlinearity in a tunnel-coupled double quantum wells

Physica E-low-dimensional Systems & Nanostructures, 2011

The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and contr... more The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and control laser fields based on intersubband transitions is investigated. The effect of controlling parameters such as intensity of coupling field and electron tunneling on nonlinear behavior of the system is then discussed. It is shown that the enhanced Kerr nonlinearity with reduced linear and nonlinear

Research paper thumbnail of Josab-30-7-1815

In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence ... more In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence of spin coherence on the optical bistability (OB) and multistability is investigated. It is shown that OB and multistability are very sensitive to the relative phase between applied fields.

Research paper thumbnail of Polarization dependence of optical bistability in the presence of external magnetic field

Research paper thumbnail of Optical properties of double cascade-type GaAs/AlGaAs multiple quantum well nanostructures via exciton spin relaxation

Research paper thumbnail of Transient absorption–dispersion properties of four-level atomic system via elliptically polarized probe light and magnetic field

Research paper thumbnail of Laser polarization dependent and magnetically control of group velocity in a dielectric medium doped with nanodiamond nitrogen vacancy centers

Research paper thumbnail of Optical bistability and multistability via biexciton coherence in semiconductor quantum well nanostructure

Research paper thumbnail of Subluminal and superluminal pulse propagation via spin coherence in a defect dielectric medium

Research paper thumbnail of Phase control of optical bistability based biexciton coherence in a quantum dot nanostructure

North-Holland, Jan 5, 2014

Research paper thumbnail of Switching from optical bistability to multistability via terahertz signal radiation in a InGaN/GaN quantum dot nanostructure

North-Holland, Jun 15, 2014

Research paper thumbnail of Enhanced Kerr Nonlinearity in a Four-Level EIT Medium

Journal of Nonlinear Optical Physics & Materials, 2010

The linear and nonlinear response of a four-level EIT system driven by three coherent fields is i... more The linear and nonlinear response of a four-level EIT system driven by three coherent fields is investigated. It is found that at appropriate atomic parameters, the Kerr nonlinearity can clearly be enhanced. It is also demonstrated that the maximal Kerr nonlinearity enters the EIT window, and the corresponding linear and nonlinear absorption suppress. Moreover, we show that nonlinear absorption and Kerr nonlinearity can also be changed via relative phase between driving fields.

Research paper thumbnail of Optical bistability via quantum interference from incoherent pumping and spontaneous emission

Journal of Luminescence, 2011

We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system c... more We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system confined in a unidirectional ring cavity via incoherent pumping field. It is shown that the threshold of optical bistability can be controlled by the rate of an incoherent pumping field and by interference mechanism arising from the spontaneous emission and incoherent pumping field. We demonstrate that the optical bistability converts to optical multi-stability (OM) by the quantum interference mechanism.

Research paper thumbnail of Lasing without population inversion in an Er-doped YAG crystal

Journal of Modern Optics, 2011

Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.

Research paper thumbnail of Enhancement of Kerr nonlinearity at long wavelength in a quantum dot nanostructure

Physica E-low-dimensional Systems & Nanostructures, 2011

The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum ... more The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum dot by employing the tunnel coupling is investigated. It is shown that by enhancement of tunnel coupling value the Kerr nonlinearity increases and at the same time linear and nonlinear absorption reduces at the long wavelength which is very important for communicational applications. Enhanced of Kerr nonlinearity in a double quantum dots is investigated. It is found that the electron tunneling has an essential role to reducing the linear absorption and increasing the Kerr nonlinearity at long wavelength.

Research paper thumbnail of Lasing without population inversion in an Er-doped YAG crystal

Journal of Modern Optics, 2012

Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.

Research paper thumbnail of Controlling the optical bistability via quantum interference in a four-level N-type atomic system

Journal of Luminescence, 2011

We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-ty... more We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-type atomic system. The effect of spontaneously generated coherence (SGC) on OB and OM is then discussed. It is found that SGC makes the medium phase dependent, so the optical bistability and multi-stability threshold can be controlled via relative phase between applied fields. We realize that the frequency detuning of probe and coupling fields with the corresponding atomic transition plays an important role in creation OB and OM. Moreover, the effect of laser coupling fields and an incoherent pumping field on reduction of OB and OM threshold is then discussed.

Research paper thumbnail of Enhanced Kerr nonlinearity in a tunnel-coupled double quantum wells

Physica E-low-dimensional Systems & Nanostructures, 2011

The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and contr... more The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and control laser fields based on intersubband transitions is investigated. The effect of controlling parameters such as intensity of coupling field and electron tunneling on nonlinear behavior of the system is then discussed. It is shown that the enhanced Kerr nonlinearity with reduced linear and nonlinear

Research paper thumbnail of Josab-30-7-1815

In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence ... more In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence of spin coherence on the optical bistability (OB) and multistability is investigated. It is shown that OB and multistability are very sensitive to the relative phase between applied fields.