Control of spontaneous emission spectra and simulation of multiple spontaneously generated coherence in a four-level atomic system

2007 ◽  
Vol 278 (1) ◽  
pp. 124-131 ◽  
Author(s):  
Jia-Hua Li ◽  
Ai-Xi Chen ◽  
Ji-Bing Liu ◽  
Xiaoxue Yang
Keyword(s):  
Spontaneous Emission ◽  
Atomic System ◽  
Emission Spectra ◽  
Spontaneously Generated Coherence

SPONTANEOUS EMISSION SPECTRA AND SIMULATING MULTIPLE SPONTANEOUSLY-GENERATED COHERENCE IN AN N-TYPE MEDIUM

2007 ◽  
Vol 21 (16) ◽  
pp. 1015-1026 ◽  
Author(s):  
JIA-HUA LI
Keyword(s):  
Spectral Line ◽  
Spontaneous Emission ◽  
Atomic System ◽  
Emission Spectra ◽  
Frequency Detuning ◽  
Driving Field ◽  
Spontaneously Generated Coherence ◽  
Line Narrowing ◽  
Emission Quenching ◽  
Spectral Line Narrowing

We investigate the spontaneous emission spectra of a coherently driven four-level cold atomic system. It is shown that a few interesting phenomena such as spectral-line narrowing, spectral-line enhancement, spectral-line suppression, and spontaneous emission quenching can be realized in our system. The spectral-line enhancement and suppression can be conveniently manipulated by appropriately modulating the frequency detuning of the probe driving field. In the dressed-state picture of the probe and coupling fields, we find that this coherently-driven atomic system has three close-lying levels so that multiple spontaneously-generated coherence (SGC) arises. Our considered atomic model can be found in real atoms, such as rubidium or sodium, so a corresponding experiment can be done to observe the expected phenomena related to SGC effect, since no rigorous conditions are required.

scholarly journals On the Enlargement of the Emission Spectra from the 4I13/2 Level of Er3+ in Silica-Based Optical Fibers through Lanthanum or Magnesium Co-Doping

Ceramics ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 364-374 ◽  
Author(s):  
Manuel Vermillac ◽  
Jean-François Lupi ◽  
Stanislaw Trzesien ◽  
Michele Ude ◽  
Wilfried Blanc
Keyword(s):  
Optical Fiber ◽  
Spontaneous Emission ◽  
Optical Fibers ◽  
Emission Spectra ◽  
Magnesium Doping ◽  
Co Doping ◽  
Erbium Doped ◽  
Optical Fiber Amplifiers ◽  
Linewidth Broadening ◽  
Solution Doping

Improving optical fiber amplifiers requires the elaboration and use of new materials and new compositions. In this sense, we prepared erbium-doped optical fiber samples that were co-doped with magnesium or lanthanum by gradual-time solution doping. Doping concentrations and thermal processes induce the formation of nanoparticles. The effect of lanthanum and magnesium contents on the width of the spontaneous emission of the 4 I 13 / 2 level of Er 3 + was characterized in the nanoparticle-rich fiber samples. For that purpose, the width was characterized by the effective linewidth and the full-width at half-maximum (FWHM). The results indicate the robustness of the effective linewidth to strong variations in the intensity profiles of the 4 I 13 / 2 spontaneous emission. Increasing the doping concentrations of both magnesium and lanthanum increases the FWHM and the effective linewidth, along with optical losses. Results show that the fabrication of nanoparticle-rich optical fibers through lanthanum or magnesium doping induces an FHWM broadening of 54% and 64%, respectively, or an effective linewidth broadening of 59% (for both elements) while maintaining a transparency that is compatible with fiber laser and amplifier applications.

Polarization Anisotropy of Spontaneous Emission Spectra in GaInAsP/InP Quantum-Wire Structures

2008 ◽  
Vol 47 (5) ◽  
pp. 3735-3741 ◽  
Author(s):  
Dhanorm Plumwongrot ◽  
Takeo Maruyama ◽  
Anisul Haque ◽  
Hideki Yagi ◽  
Koji Miura ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Quantum Wire ◽  
Emission Spectra ◽  
Polarization Anisotropy

Hole-Burnings Observed at High Energy Tails in Spontaneous Emission Spectra from 1.3 µm-InGaAsP/InP Lasers

1982 ◽  
Vol 21 (Part 2, No. 4) ◽  
pp. L240-L242 ◽  
Author(s):  
Masamichi Yamanishi ◽  
Ikuo Suemune ◽  
Kazuhiro Nonomura ◽  
Nobuo Mikoshiba
Keyword(s):  
Spontaneous Emission ◽  
Emission Spectra ◽  
High Energy
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