Sample interview questions: What are some common techniques for achieving tunable laser output in laser systems?
Sample answer:
Common Techniques for Tunable Laser Output:
- Dielectric Interference Grating: A grating with varying groove spacing can selectively reflect or transmit specific wavelengths, enabling tuning over a wide range.
- Thin Solid-State Plates: Birefringent plates, such as calcite or lithium niobate, induce polarization and wavelength-dependent phase shifts, allowing for tuning by rotation or tilting.
- Liquid Crystal Variable Retarders: Liquid crystals can alter their refractive index and phase retardation in response to an applied electric field, providing tunability by controlling the voltage.
- Diffractive Optics: Holograms or diffraction gratings can disperse light and emit specific wavelengths when illuminated, enabling reconfigurable laser output.
- Intracavity Etalons: Resonant cavities with Fabry-Perot interferometers can selectively amplify specific wavelengt… Read full answer