Stimulated emission and optical gain spectrum in highly excited CdSe

1980 ◽  
Vol 51 (4) ◽  
pp. 2236 ◽  
Author(s):  
A. Cingolani ◽  
M. Ferrara ◽  
M. Lugarà
Keyword(s):  
Optical Gain ◽  
Stimulated Emission ◽  
Gain Spectrum

scholarly journals Signature of Generalized Gibbs Ensemble Deviation from Equilibrium: Negative Absorption Induced by a Local Quench

Entropy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 220
Author(s):  
Lorenzo Rossi ◽  
Fabrizio Dolcini ◽  
Fabio Cavaliere ◽  
Niccolò Traverso Ziani ◽  
Maura Sassetti ◽  
...  
Keyword(s):  
Optical Gain ◽  
Electron System ◽  
Bound State ◽  
Stimulated Emission ◽  
Optical Measurements ◽  
Gibbs Ensemble ◽  
Attractive Potential ◽  
Dimensional Electron System ◽  
Constants Of Motion ◽  
Generalized Gibbs Ensemble

When a parameter quench is performed in an isolated quantum system with a complete set of constants of motion, its out of equilibrium dynamics is considered to be well captured by the Generalized Gibbs Ensemble (GGE), characterized by a set {λα} of coefficients related to the constants of motion. We determine the most elementary GGE deviation from the equilibrium distribution that leads to detectable effects. By quenching a suitable local attractive potential in a one-dimensional electron system, the resulting GGE differs from equilibrium by only one single λα, corresponding to the emergence of an only partially occupied bound state lying below a fully occupied continuum of states. The effect is shown to induce optical gain, i.e., a negative peak in the absorption spectrum, indicating the stimulated emission of radiation, enabling one to identify GGE signatures in fermionic systems through optical measurements. We discuss the implementation in realistic setups.

Optical Gain Spectrum in CdSe Under Strong Laser Excitation

1980 ◽  
Vol 27 (8) ◽  
pp. 1213-1219 ◽  
Author(s):  
I.M. Catalano ◽  
A. Cingolani ◽  
M. Ferrara ◽  
M. Lugarà
Keyword(s):  
Laser Excitation ◽  
Optical Gain ◽  
Gain Spectrum ◽  
Strong Laser

scholarly journals Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 609 ◽  
Author(s):  
Muhammad Zeb ◽  
Muhammad Tahir ◽  
Fida Muhammad ◽  
Suhana Mohd Said ◽  
Mohd Faizul Mohd Sabri ◽  
...  
Keyword(s):  
Single Crystal ◽  
Spontaneous Emission ◽  
Threshold Energy ◽  
Pump Energy ◽  
Optical Gain ◽  
Amplified Spontaneous Emission ◽  
Stimulated Emission ◽  
Excitation Wavelength ◽  
Optical Amplification ◽  
Organic Single Crystal

In this paper, we report optical characteristics of an organic single crystal oligomer 5,5⁗-diphenyl-2,2′:5′,2″:5″,2‴:5‴,2⁗-quinquethiophene (P5T). P5T crystal is a thiophene/phenylene co-oligomer that possesses better charge mobility as well as photoluminescence quantum efficiency (PLQE) as compared to other organic materials. Stimulated emission in P5T is investigated via amplified spontaneous emission (ASE) measurements within broad pump energies ranging from 35.26 to 163.34 µJ/cm2. An Nd-YAG femtosecond-tunable pulsed laser is used as a pump energy source for the ASE measurements of P5T crystals at an excitation wavelength of 445 nm. The ASE spectra exhibit optical amplification in P5T crystals at a 625 nm peak wavelength with a lower threshold energy density (Eth) ≈ 52.64 μJ/cm2. P5T also demonstrates higher optical gain with a value of 72 cm−1, that is calculated by using the variable stripe-length method. The value of PLQE is measured to be 68.24% for P5T. This study proposes potential applications of P5T single crystals in organic solid state lasers, photodetectors, and optical amplifiers.

Angular-momentum-dependent optical gain spectrum based on stimulated degenerate four-wave mixing

2019 ◽  
Vol 52 (18) ◽  
pp. 185002
Author(s):  
Hai-Tao Zhou ◽  
Rui-Feng Li ◽  
Yu-Peng Dai ◽  
Dan Wang ◽  
Jin-Ze Wu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Optical Gain ◽  
Four Wave Mixing ◽  
Gain Spectrum ◽  
Wave Mixing ◽  
Degenerate Four Wave Mixing

Erbium-Doped Barium Titanate Thin Film Waveguides For Integrated Optical Amplifiers

2001 ◽  
Vol 694 ◽  
Author(s):  
Andrew R. Teren ◽  
Seong-Soo Kim ◽  
Seng-Tiong Ho ◽  
Bruce W. Wessels
Keyword(s):  
Thin Film ◽  
Optical Gain ◽  
Chemical Vapor ◽  
Stimulated Emission ◽  
Organic Chemical ◽  
Factors Affecting ◽  
Luminescence Efficiency ◽  
Metal Organic ◽  
Thin Film Waveguides ◽  
Er Doped

AbstractThe factors affecting optical gain were studied for Er-doped BaTiO3 thin film waveguides. Er-doped BaTiO3 with dopant concentrations of 0.3 – 9 at.% was deposited by metal-organic chemical vapor deposition. The luminescence efficiency was maximized by optimizing the growth temperatureand erbium concentration as well as by post-deposition annealing. Stimulated emission was studied using the pump-probe technique over the spectral range of 1,520-1,550 nm. A maximum differential gain of 3 dB/cm wasmeasured at 1,540 nm in an 8 mm long, 8 μm wide ridge waveguide.

Stimulated emission and optical gain in a single MOVPE-grownZnxCd1−xSe−ZnSequantum well

1998 ◽  
Vol 57 (20) ◽  
pp. 13077-13085 ◽  
Author(s):  
R. Tomašiūnas ◽  
I. Pelant ◽  
B. Hönerlage ◽  
R. Lévy ◽  
T. Cloitre ◽  
...  
Keyword(s):  
Optical Gain ◽  
Stimulated Emission

Erbium-Doped Barium Titanate Thin FilmWaveguides For Integrated Optical Amplifiers

2001 ◽  
Vol 688 ◽  
Author(s):  
Andrew R. Teren ◽  
Seong-Soo Kim ◽  
Seng-Tiong Ho ◽  
Bruce W. Wessels
Keyword(s):  
Optical Gain ◽  
Chemical Vapor ◽  
Stimulated Emission ◽  
Organic Chemical ◽  
Pump Probe ◽  
Factors Affecting ◽  
Luminescence Efficiency ◽  
Metal Organic ◽  
Thin Film Waveguides ◽  
Er Doped

AbstractThe factors affecting optical gain were studied for Er-doped BaTiO3 thin film waveguides. Er-doped BaTiO3 with dopant concentrations of 0.3 – 9 at.% was deposited by metal-organic chemical vapor deposition. The luminescence efficiency was maximized by optimizing the growth temperature and erbium concentration as well as by post-deposition annealing. Stimulated emission was studied using the pump-probe technique over the spectral range of 1,520-1,550 nm. A maximum differential gain of 3 dB/cm was measured at 1,540 nm in an 8 mm long, 8 μm wide ridge waveguide.

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