Littrow configuration

Littrow configuration is a design used in optical devices, particularly spectrometers and diffraction gratings. In this setup, light enters at a specific angle and is reflected or diffracted back out at the same angle. This arrangement maximizes the intensity of the light that is analyzed, allowing for precise measurements of wavelengths and spectra. It's named after the Austrian scientist Joseph von Littrow, and it’s commonly used in scientific instruments to study the properties of light in various applications, including telecommunications and spectroscopy.