Hello Friends in this article i am gone to share Quantum Cascade Lasers and Low-Dimensional Structures Quiz Answers with you. | Nanophotonics and Detectors
Quantum Cascade Lasers and Low-Dimensional Structures Quiz Answers
Question 1)
How does the quantum cascade laser allow operation at long wavelengths?
- Direct transitions in small bandgap material
- Intersub-band transitions in bulk material
- Intersubband transitions in layered structures
- None of the above
Question 2)
Why is it hard to generate short wavelengths from quantum cascade lasers?
- Hard to generate intersubband tranisitions with proper energy
- Losses of carriers due to thermionic emission
- Lack of suitable materials
- None of the above
Question 3)
For a 1-D structure, what is the square of the density of states proportional to? Your answer should be a mathematical expression in terms of energy, E.
Enter math expression here
Answer: 1/E
Question 4)
What is the advantage of a quantum dot laser?
- They have higher gain than quantum well or bulk lasers.
- They have a lower threshold than quantum well or bulk lasers.
- Enable lasing in materials systems where it is not possible with other means
- All of the above
Question 5)
How does the quantum cascade laser allow operation at long wavelengths?
- Intersubband transitions in layered structures
- Direct transitions in small bandgap material
- Intersub-band transitions in bulk material
- None of the above