What Does FPI Stand For?

FPI stands for Fabry Perot Interferometer

FPI, or Fabry Perot Interferometer, is an optical device that utilizes multiple beam interference to analyze wavelengths of light. It consists of two highly reflective mirrors positioned parallel to each other, allowing light to bounce between them. This configuration enables precise measurements of light frequency and is widely used in spectroscopy, telecommunications, and metrology for its ability to resolve fine spectral details and enhance signal accuracy.