Stimulated Emission and Optical Gain

2006 ◽  
pp. 327-350
Keyword(s):  
Optical Gain ◽  
Stimulated Emission

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.

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.

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.

Stimulated emission and optical gain in PbSe quantum dot-doped liquid-core optical fiber based on multi-exciton state

2016 ◽  
Vol 369 ◽  
pp. 171-178 ◽  
Author(s):  
Lei Zhang ◽  
Bing Zhang ◽  
Shuai Li ◽  
Qiang Zhu ◽  
Youjin Zheng
Keyword(s):  
Quantum Dot ◽  
Optical Fiber ◽  
Liquid Core ◽  
Optical Gain ◽  
Exciton State ◽  
Stimulated Emission

Low-threshold stimulated emission in perovskite quantum dots: single-exciton optical gain induced by surface plasmon polaritons at room temperature

2020 ◽  
Vol 8 (17) ◽  
pp. 5847-5855
Author(s):  
Litao Zhao ◽  
Yu Chen ◽  
Xiantong Yu ◽  
Xiao Xing ◽  
Jinquan Chen ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Room Temperature ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Perovskite Quantum Dots ◽  
Low Threshold ◽  
Halide Perovskite ◽  
Plasmon Polaritons ◽  
Lead Halide

The surface plasmon polaritons induced single-exciton lasing of lead halide perovskite QDs in room temperature may provide a new concept for the further design of low threshold stimulated emission colloidal nanocrystal lasers.

scholarly journals Advances in inorganic and hybrid perovskites for miniaturized lasers

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2251-2272 ◽  
Author(s):  
Zhengzheng Liu ◽  
Sihao Huang ◽  
Juan Du ◽  
Chunwei Wang ◽  
Yuxin Leng
Keyword(s):  
Carrier Lifetime ◽  
Optical Gain ◽  
Whispering Gallery Mode ◽  
Travelling Wave ◽  
Stimulated Emission ◽  
Narrow Linewidth ◽  
Quality Factors ◽  
Whispering Gallery ◽  
Fundamental Properties ◽  
Fabry Perot

AbstractThe rapid advancement of perovskite-based optoelectronics devices has caught the world’s attention due to their outstanding properties, such as long carrier lifetime, low defect trap density, large absorption coefficient, narrow linewidth and high optical gain. Herein, the photonic lasing properties of perovskites are reviewed since the first stimulated emission of perovskites observed in 2014. The review is mainly focused on 3D structures based on their inherently active microcavities and externally passive microcavities of the perovskites. First, the fundamental properties in terms of crystal structure and optical characteristics of perovskites are reviewed. Then the perovskite lasers are classified into two sections based on the morphology features: the ability/inability to support lasing behaviors by themselves. Every section is further divided into two kinds of cavities according to the light reflection paths (Standing wave for the Fabry–Pérot cavity and travelling wave for the Whispering-Gallery-Mode cavity). The lasing performance involves fabrication methods, cavity sizes, thresholds, quality factors, pumping sources, etc. Finally, some challenges and prospects for perovskite lasers are given.

scholarly journals Nanocrystal Quantum Dots: Building Blocks for Tunable Optical Amplifiers and Lasers

2001 ◽  
Vol 667 ◽  
Author(s):  
Jennifer A. Hollingsworth ◽  
Alexander A. Mikhailovsky ◽  
Anton Malko ◽  
Victor I. Klimov ◽  
Catherine A. Leatherdale ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement ◽  
Optical Amplifiers ◽  
Optical Gain ◽  
Building Blocks ◽  
Stimulated Emission ◽  
Optical Amplification ◽  
Organometallic Reactions ◽  
Wide Range ◽  
Nanocrystal Quantum Dots

ABSTRACTWe study optical processes relevant to optical amplification and lasing in CdSe nanocrystal quantum dots (NQD). NQDs are freestanding nanoparticles prepared using solution-based organometallic reactions originally developed for the Cd chalcogenides, CdS, CdSe and CdTe [J. Am. Chem. Soc. 115, 8706 (1993)]. We investigate NQDs with diameters ranging from 2 to 8 nm. Due to strong quantum confinement, they exhibit size-dependent spectral tunability over an energy range as wide as several hundred meV. We observe a strong effect of the matrix/solvent on optical gain properties of CdSe NQDs. In most of the commonly used solvents (such as hexane and toluene), gain is suppressed due to strong photoinduced absorption associated with carriers trapped at solvent-related interface states. In contrast, matrix-free close packed NQD films (NQD solids) exhibit large optical gain with a magnitude that is sufficiently high for the optical gain to successfully compete with multiparticle Auger recombination [Science 287, 10117 (2000)]. These films exhibit narrowband stimulated emission at both cryogenic and room temperature, and the emission color is tunable with dot size [Science 290, 314 (2000)]. Moreover, the NQD films can be incorporated into microcavities of different geometries (micro-spheres, wires, tubes) that produce lasing in whispering gallery modes. The facile preparation, chemical flexibility and wide-range spectral tunability due to strong quantum confinement are the key advantages that should motivate research into NQD applications in optical amplifiers and lasers.

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