Book contents
- Frontmatter
- Dedication
- Contents
- Preface
- Part I Bandstructure Engineering, Modeling and State-of-the-Art QCLs
- 1 Basic Physics of Intersubband Radiative and Nonradiative Processes
- 2 State-of-the-Art Mid-Infrared QCLs: Elastic Scattering, High CW Power, and Coherent-Power Scaling
- 3 Long-Wavelength Mid-Infrared Quantum Cascade Lasers
- 4 Overview of the State-of-the-Art Terahertz QCL Designs
- 5 Simulating Quantum Cascade Lasers: The Challenge to Quantum Theory
- 6 Coupled Simulation of Quantum Electronic Transport and Thermal Transport in Mid-Infrared Quantum Cascade Lasers
- Part II Active Research Topics
- Part III Applications
- Index
1 - Basic Physics of Intersubband Radiative and Nonradiative Processes
from Part I - Bandstructure Engineering, Modeling and State-of-the-Art QCLs
Published online by Cambridge University Press: 25 August 2023
- Frontmatter
- Dedication
- Contents
- Preface
- Part I Bandstructure Engineering, Modeling and State-of-the-Art QCLs
- 1 Basic Physics of Intersubband Radiative and Nonradiative Processes
- 2 State-of-the-Art Mid-Infrared QCLs: Elastic Scattering, High CW Power, and Coherent-Power Scaling
- 3 Long-Wavelength Mid-Infrared Quantum Cascade Lasers
- 4 Overview of the State-of-the-Art Terahertz QCL Designs
- 5 Simulating Quantum Cascade Lasers: The Challenge to Quantum Theory
- 6 Coupled Simulation of Quantum Electronic Transport and Thermal Transport in Mid-Infrared Quantum Cascade Lasers
- Part II Active Research Topics
- Part III Applications
- Index
Summary
Quantum cascade lasers are based on Intersubband transitions between quantum confined states in semiconductor heterostructures. The origin of these states is briefly described in this chapter starting with linear combination of atomic orbitals and then proceeding to the k.P theory. The relations between the interband and Intersubband transitions including their oscillator strength and selection rules are established. It is shown that “giant” Intersubband dipole owes its existence to the confinement induced band mixing. Aside from the radiative Intersubband transitions investigated in this chapter, nonradiative transitions also play important roles in QCL operation, hence most relevant of these processes: electron phonon, electron-electron, interface roughness and alloy disorder are also described in detail.
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- Mid-Infrared and Terahertz Quantum Cascade Lasers , pp. 3 - 40Publisher: Cambridge University PressPrint publication year: 2023