Sample interview questions: What are some common techniques for achieving high-power laser output in the terahertz range?
Sample answer:
- Quantum cascade lasers (QCLs): These devices use a series of quantum wells to create a population inversion, resulting in the emission of THz radiation. QCLs are compact and efficient, but they require cryogenic cooling to operate.
- Free-electron lasers (FELs): These devices use a relativistic electron beam to generate THz radiation. FELs are powerful and tunable, but they are also large and expensive.
- Optically pumped THz lasers: These devices use an optical pump laser to excite a gain medium, which then emits THz radiation. Optically pump… Read full answer