OHARA has a widely recognized and extensive state of the art metrology capability. Our Service Center accepts orders from worldwide customers for precision measurements of refractive index, homogeneity, internal transmittance, etc. We are especially proud of our interferometers. Our Zygo Mark III-6 inch, Zygo Mark IV-18 inch, and Zygo GPI-XP-12 inch (full automatic feed) interferometers are all operated under super air conditioned clean room conditions. Our Moeller-Wedel Goniometer is available for the world's highest accuracy refractive index measurements. Would you like to learn more about our production and measurement capabilities?