Sample interview questions: What are some common techniques for achieving ultrashort laser pulses in the terahertz range?
Sample answer:
- Nonlinear optics: This technique relies on the nonlinear response of materials to high-intensity light. By using nonlinear materials, such as crystals or semiconductors, it is possible to generate new frequencies that are not present in the input light. This process can be used to generate THz pulses with durations in the femtosecond range.
- Optical parametric amplification (OPA): This technique uses a nonlinear crystal to amplify a seed pulse of light. The seed pulse is typically generated by a laser oscillator, and the nonlinear crystal is pumped by a high-power laser. The OPA process can be used to generate THz pulses wit… Read full answer