Topic
Quantum well
About: Quantum well is a research topic. Over the lifetime, 44627 publications have been published within this topic receiving 674023 citations. The topic is also known as: QW & quantum potential well.
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TL;DR: It is demonstrated that the quantum dot is sensitive to changes in the local environment at the single-charge level and the main source of charge noise in the commonly used optical field-effect devices is identified.
Abstract: We probe local charge fluctuations in a semiconductor via laser spectroscopy on a nearby self-assembled quantum dot We demonstrate that the quantum dot is sensitive to changes in the local environment at the single-charge level By controlling the charge state of localized defects, we are able to infer the distance of the defects from the quantum dot with $\ifmmode\pm\else\textpm\fi{}5\text{ }\text{ }\mathrm{nm}$ resolution The results identify and quantify the main source of charge noise in the commonly used optical field-effect devices
128 citations
Book•
01 Jan 1995
TL;DR: In this article, the authors present a survey of external-cavity laser designs and their applications in tunable laser spectroscopy, focusing on the use of CO2 Isotope Lasers outside their fundamental 8.9-to 12.4-m Wavelength range.
Abstract: F. J. Duarte, Introduction: Tunable Laser Complementarity. Goal of This Book. F. J. Duarte, Narrow-Linewidth Oscillators and Intracavity Dispersion: Dispersive Oscillator Configurations. Physical Dimensions. Generalized Interference Equation. Dispersion Linewidth Equation. Beam Divergence. Intracavity Dispersion. Intracavity Multiple-Prism Dispersion and Pulse Compression. Transmission Efficiency of Multiple-Prism Arrays. Wavelength Tuning. Appendix: Dispersion of Multiple-Prism Arrays and 4 x 4 Transfer Matrices. R. C. Sze and D.G. Harris, Tunable Excimer Lasers: Excimer Active Media. Tuning of Discharge and Electron Beam Pumped Excimer Lasers. Discharge Excimer Lasers. Charles Freed,CO2 Isotope Lasers and Their Applications in Tunable Laser Spectroscopy: Vibrational Energy-Level Structive of the CO2 Molecule. Rotational Energy-Level Substructure of the CO2 Molecule. Processes Governing the Excitation of Regular BandLaser Transitions in CO2. Additional Characteristics of Regular Band CO2 Lasers Transitions. Lineshape Functions and Broadening Due to Gas Pressure and Doppler Shift in CO2 Gas. Spectral Purity and Short-Term Stability. Long-Term Line-Center Stabilization of CO2 Lasers. Absolute Frequencies of Regular Band Lasing Transitions in Nine CO2 Isotopic Species. Pressure Shifts in Line-Center-Stabilized CO2 Lasers. Small-Signal Gain and Saturation Intensity of Regular Band Lasing Transitions in Sealed-off CO2 Isotope Lasers. Laser Design. Spanning the Frequency Range between Line-Center Stabilized CO2 Laser Transitions. Spectroscopic Use of CO2 Lasers outside Their Fundamental 8.9- to 12.4-(m Wavelength Range. F. J. Duarte, Dye Lasers: Laser-Pumped Pulsed Dye Lasers. Flashlamp-Pumped Dye Lasers. cw Laser-Pumped Dye Lasers. Appendix of Laser Dyes. Norman P. Barnes, Transition Metal Solid-State Lasers: Transition Metal and Lanthanide Series Lasers. Physics of Transition Metal Lasers. Cr:AlO3. Cr:BeAl2O3 Ti:Al2O3. Cr:LiCaAIF6 and Cr:LiSrAlF6. Cr:GSGG, Cr:YSAG, and Cr:GSAG. Co:MgF2, Ni:MgF2, and V:MgF2. Wavelength Control Methods. Norman P. Barnes, Optical Parametric Oscillators: Parametric Interactions. Parametric Oscillation. Spectral bandwidth and Acceptance Angles. Birefringence Effects. Average Power Limitations. Nonlinear Crystals. Phase-Matching Calculations. Performance. Tuning. Paul Zorabedian, Tunable External-Cavity Semiconductor Lasers: Semiconductor Optical Gain Media. Classes of External-Cavity Lasers. First-Order Properties. Feedback Model. External-Cavity Design. Cavity Components. Survey of External-Cavity laser Designs. Mode Selectivity of Grating Cavities. Phase-Continuous Tuning. Characterization Methods for External-Cavity Lasers. Measurement of Facet and External-Cavity Reflectances. Multimode Suppression. Multiple-Wavelength Operation. Wavelength Stabilization. Advanced Modeling Topics. Construction and Packaging. Applications. Stephen Vincent Benson, Tunable Free-Electron Lasers: Methods of Wavelength Tuning. Broadly Tunable Optical Cavities. Wiggler Considerations. Tunable Laser Facilities and Their Characteristics. Summary. References. Subject Index. F. J. Duarte, Introduction. F. J. Duarte, Narrow-Linewidth Oscillators and Intracavity Dispersion. R. C. Sze and D.G. Harris, Tunable Excimer Lasers. Charles Freed, CO2 Isotope Lasers and Their Applications in Tunable Laser Spectroscopy. F. J. Duarte, Dye Lasers. Norman P. Barnes, Transition Metal Solid-State Lasers. Norman P. Barnes, Optical Parametric Oscillators. Paul Zorabedian, Tunable External-Cavity Semiconductor Lasers. Stephen Vincent Benson, Tunable Free-Electron Lasers. References. Subject Index.
127 citations
TL;DR: In this paper, an array of GaAs/AlGaAs cleaved edge overgrowth quantum wires was studied using a low temperature near field scanning optical microscope, and three luminescence peaks originate from different structures in the sample.
Abstract: We report the first spectroscopic study using a low temperature near‐field scanning optical microscope. We have studied an array of GaAs/AlGaAs cleaved edge overgrowth quantum wires. The three luminescence peaks originate from different structures in the sample: The (001)‐oriented multiple quantum wells, the (110)‐oriented single quantum well, and the quantum wires. The linewidth of the quantum wire emission is related to roughness in the (110)‐oriented single quantum well. Quenching of the multiple quantum wells and single quantum well emission near the quantum wires is attributed to diffusion of photoexcited carriers into the wires.
127 citations
TL;DR: In this article, the authors used quantum dots for photonic integration and achieved state-of-the-art performance and gain recovery at sub-picosecond timescales.
Abstract: Laser gain regions using quantum dots have numerous improvements over quantum wells for photonic integration. Their atom-like density of states gives them unique gain properties that can be finely tuned by changing growth conditions. The gain bandwidth can be engineered to be broad or narrow and to emit at a wide range of wavelengths throughout the near infrared. The large energy level separation of the dot states from the surrounding material results in excellent high-temperature performance and gain recovery at sub-picosecond timescales. The fact that the quantum dots are isolated from each other and act independently at inhomogeneously broadened wavelengths results in ultralow linewidth enhancement factors, highly stable broadband mode-locked lasers, single-section mode locking, and the possibility of reduced crosstalk between amplified signals at low signal injection and enhanced four-wave mixing at high signal injection. The high carrier confinement and areal dot density provide reduced sensitivity to crystalline defects allowing for long device lifetimes even when epitaxially grown on silicon at high dislocation densities.
127 citations
TL;DR: In this paper, the authors present a quantum cascade laser operating on a thermoelectric cooler up to a record-high temperature of 210.5 K. The active region design is based on only two quantum wells and achieves high temperature operation thanks to a systematic optimization by means of a nonequilibrium Green's function model.
Abstract: We present a \MF{terahertz} quantum cascade laser operating on a thermoelectric cooler up to a record-high temperature of 210.5 K. The active region design is based on only two quantum wells and achieves high temperature operation thanks to a systematic optimization by means of a nonequilibrium Green's function model. Laser spectra were measured with a room temperature detector, making the whole setup cryogenic free. At low temperatures ($\sim 40 K), a maximum output power of 200 mW was measured.
127 citations