Cavity Ring-Down

Determination of the Reflectivity and Transmittance of Low Loss Optical Components

Reflectivity values R > 99 % and transmittance values T > 99 % of Low Loss optical components can be measured very exactly by Cavity Ring-Down time measurements. Compared to measurements in a photospectrometer this method has three main advantages:

  • it is applicable for very high reflectivities und transmittances
  • it is impossible to get measurement values which are higher than the real ones
  • it has a very high accuracy

Basic CRD Measurement Setup
Basic CRD Measurement Setup


LAYERTEC comes with various Cavity Ring-Down systems with which the quality of optical components is controlled steadily.