Phase conjugation in magnetized semiconductors by stimulated Brillouin scattering

Sen, Pranay K.; Sen, Pratima; Vivek, Sarika

doi:10.1088/0022-3727/29/1/001

Cited by 20 publications

(20 citation statements)

References 16 publications

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“…The saturation has its origin in the nonlinear absorption coefficient of the crystal at high excitation intensity. The behavior of reflectivity is in agreement with theoretical investigations carried out by Sen et al [23]. In order to study the effect of excitation intensity on purely electrostrictive OPC-SBS reflectivity, ðÞ es ðLÞ 2 versus I 0 is plotted in Figure 2(b) in the absence of both piezoelectricity and free carrier concentration.…”

Section: Opc-sbs Reflectivity Characteristicssupporting

confidence: 86%

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Phase conjugation in weakly piezoelectric magnetized semiconductor-plasmas

Aghamkar

Singh

2008

Journal of Modern Optics

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The occurrence of optical phase conjugation via stimulated Brillouin scattering (OPC-SBS) in weakly piezoelectric III-V semiconductor plasmas subjected to a large magnetostatic field under off-resonant transition regime has been explored theoretically. The reflectivity of the phase conjugate wave is dependent upon the Brillouin susceptibility and can be significantly enhanced through n-type doping of the crystal and the simultaneous application of a magnetostatic field. Moreover, the threshold pump intensity required for the occurrence of SBS in the crystal with finite optical attenuation can be considerably diminished through proper selection of the doping concentration and magnetostatic field. Consequently, OPC-SBS becomes a possible tool in phase-conjugate optics even under not-too-high power laser excitation by using doped n-type semiconductors kept under the influence of a large magnetostatic field. Numerical estimates made for n-InSb crystal at 77 K duly irradiated by a nanosecond pulsed 10.6 mm CO 2 laser reveal that high OPC-SBS reflectivity can be achieved at excitation intensities below the optical damage threshold if the semiconductor crystal is used as an optical waveguide with an interaction length of a few millimetres.

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Section: Opc-sbs Reflectivity Characteristicssupporting

confidence: 86%

“…The characteristic dependence of OPC-SBS reflectivity on pump intensity, magnetic field and doping concentration in n-InSb irradiated with a 10.6 mm CO 2 laser is studied using Equations (23) and (24) for L51. The results are plotted in Figures 3-5.…”

Section: Opc-sbs Reflectivity Characteristicsmentioning

confidence: 99%

Phase conjugation in weakly piezoelectric magnetized semiconductor-plasmas

Aghamkar

Singh

2008

Journal of Modern Optics

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“…We have generated the momentum space wave function through Fourier transformation of the position space wave function 30 and the corresponding densities were used to compute the HP as 〈 r 2 〉〈 p 2 〉. In Table I, we have presented the numerical results of HP corresponding to the modified Yukawa potential given by Eq.…”

Section: Numerical Resultsmentioning

confidence: 99%

Net information measures for modified Yukawa and Hulthén potentials

Patil

Sen

2007

Int J of Quantum Chemistry

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ABSTRACT:The dimensional analyses of the position and momentum variancesbased quantum mechanical Heisenberg uncertainty measure, as well as the entropic information measures given by the Shannon information entropy sum and the product of Fisher information measures are carried out for two widely used nonrelativistic isotropic exponential-cosine screened Coulomb potentials generated by multiplying the superpositions of (i) Yukawa-like, Ϫ Z ͑e Ϫr /r), and (ii) Hulthén-like, Ϫ Z ͑1/͑e r Ϫ 1͒͒, potentials by cos(br) followed by addition of the term a/r 2 , where a and b Ն 0, are the screening parameters and Z, in case of atoms, denotes the nuclear charge. Under the spherical symmetry, all the information measures considered are shown to be independent of the scaling of the set [, Z] at a fixed value of /Z, a, and b and the other parameters defining the superpositions of the potentials. Numerical results are presented, which support the validity of the scaling properties.

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“…Confined quantum systems are of interest since they can be used to model systems at extreme pressures, including astrophysical and nanotechnological ones . It has been noted that the entropy sum in the confined hydrogen atom displays critical (extremal) points at different confinement radius in both the ground and excited states. This is independent of the method by which the wave function is obtained.…”

Section: Introductionmentioning

confidence: 99%

Shannon‐information entropy sum in the confined hydrogenic atom

Salazar

Laguna

Prasad

et al. 2020

Int J of Quantum Chemistry

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The appearance of critical points in the Shannon entropy sum as a function of confinement radius, in ground and excited state confined hydrogenic systems, is discussed. We illustrate that the Coulomb potential in tandem with the hard sphere confinement are responsible for these points. The positions of these points are observed to vary with the intensity of the potential. The effects of the Coulomb potential on the system are further probed, by examining the differences between the densities of the confined atom and those of the particle confined in a spherical box, for the same confinement radius. These differences are quantified by using Kullback-Leibler and cumulative residual Kullback-Leibler distance measures from information theory. These measures detect that the effects of the Coulomb potential are squeezed out of the system as the confinement radius decreases. That is, the confined atom densities resemble the particle in a box ones, for smaller confinement radii. Furthermore, the critical points in the entropy sum lie in the same regions where there are changes in the distance measures, as the atom behaves more particle in a spherical box-like. The analysis is further complemented by examination of the derivative of the entropy sum with respect to confinement radius. This study illustrates the inhomogeneity in the magnitudes of the derivatives of the entropy sum components and their dependence on the Coulomb potential. A link between the derivative and the entropic force is also illustrated and discussed. Similar behaviors are observed when the virial ratio is compared to the entropic power one, as a function of confinement radius. K E Y W O R D S confined hydrogen atom, Kullback-Leibler distance measures, quantum uncertainties, Shannon entropy sum

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Phase conjugation in magnetized semiconductors by stimulated Brillouin scattering

Cited by 20 publications

References 16 publications

Phase conjugation in weakly piezoelectric magnetized semiconductor-plasmas

Phase conjugation in weakly piezoelectric magnetized semiconductor-plasmas

Net information measures for modified Yukawa and Hulthén potentials

Shannon‐information entropy sum in the confined hydrogenic atom

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