Optical glass refractometry using holographic interferometry

The refractive index of optical glass is typically measured using techniques based on the change of the direction light experiences after traveling through the sample; that is, using deflectoruetric methods such as: minimum deviation goniometry, critical angle procedures, moire deflectometry, etc. , (Ref.l) . On the other hand, interferometry has been used to evaluate the optical homogeneity of optical glass, as well as to determine the refractive index variation with temperature.