نتایج جستجو برای: spontaneous emission

تعداد نتایج: 290199  

2012
Amandeep kaur Jagtar Singh

To achieve population inversion an EDFA uses stimulated emission process where incident photon and emitted photon have same phase. But, alongwith the stimulated emission that creates gain, the gain medium also produces spontaneous emission, which gives rise to the amplified spontaneous emission (ASE) spectrum of the amplifier []. In this paper we have considered the setup to measure amplified s...

2008
M Afzelius

We report an interference experiment of spontaneous emission of light from two distant solid-state ensembles of atoms that are coherently excited by a short laser pulse. The ensembles are Erbium ions doped into two LiNbO3 crystals with channel waveguides, which are placed in the two arms of a MachZehnder interferometer. The light that is spontaneously emitted after the excitation pulse shows fi...

2008
Heeso Noh Michael Scharrer Mark A. Anderson Robert P. H. Chang Hui Cao

We measured the angleand polarization-resolved reflection and photoluminescence spectra of ZnO inverse opals. Significant enhancement of spontaneous emission is observed. The enhanced emission not only has good directionality but can also be linearly polarized. A detailed theoretical analysis and numerical simulation reveal that such enhancement is caused by the abnormal dispersion of a high-or...

Journal: :Optics letters 2012
Xiaolong Zhu Fengxian Xie Lei Shi Xiaohan Liu N Asger Mortensen Sanshui Xiao Jian Zi Wallace Choy

We demonstrate that a broadband enhancement of spontaneous emission can be achieved within a photonic-plasmonic structure. The structure can strongly modify the spontaneous emission by exciting plasmonic modes. Because of the excited plasmonic modes, an enhancement up to 30 times is observed, leading to a 4 times broader emission spectrum. The reflectance measurement and the finite-difference t...

Journal: :iranian journal of science and technology transactions of mechanical engineering 2015
r.s. lebelo o.d. makinde

in this paper, we examine the effects of thermal radiation on co2 emission and o2 depletion in an exothermic reactive slab of combustible materials with uniform surface temperature. the governing equations for the nonlinear heat and mass transfer problem are derived and solved numerically using runge-kutta-fehlberg method with shooting technique. numerical expressions for temperature field, co2...

1999
Holger F. Hofmann Ortwin Hess

We present quantum Maxwell-Bloch equations ~QMBE! for spatially inhomogeneous semiconductor laser devices. The QMBE are derived from fully quantum mechanical operator dynamics describing the interaction of the light field with the quantum states of the electrons and the holes near the band gap. By taking into account field-field correlations and field-dipole correlations, the QMBE include quant...

2011

The fluorescence and amplified spontaneous emission characteristics of rhodamine 6G impregnated in polyacrylamide is reported in this chapter. Using amplified spontaneous emission gain radiative and related properties of this dye doped matrix was measured. It was found that photostability of rhodamine 6G is unusually high in this matrix compared to other polymer hosts like polyrnethylmethacrylate.

Journal: :Optics letters 2002
Jia-Yu Zhang Xiao-Yong Wang Min Xiao

The spontaneous-emission lifetime of CdSe/CdS core-shell quantum dots was studied as a function of the distance between the dots and a polished Si surface. The experimental results reveal a significant modification of the spontaneous-emission rate of the quantum dots by the Si surface.

Journal: :Optics letters 1992
G Yao Y C Chen C M Harding S M Sherrick R J Dalby R G Waters C Largent

The spontaneous-emission factor in an unstable-resonator semiconductor laser is enhanced by more than 2 orders of magnitude compared with that of a Fabry-Perot semiconductor laser having the same volume. A clear linkage has been observed among the spontaneous-emission factor, the waveguiding property, and the width of the lasing spectral envelope.

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