Zygo GPI

Models in this family

1. 

   GPI
2. 

   GPI 4'' XP 512

   The Zygo GPI 4'' XP 512 is an interferometer.

3. 

   GPI to Verifire

   The Zygo GPI to Verifire is a laser Fizeau interferometer designed to upgrade classic Zygo GPI systems to the Verifire platform, combining reliable optical metrology with modern imaging and vibration-tolerant technology.

4. 

   GPI XP

   The Zygo GPI XP Interferometer is a phase-modulating interferometer for noncontact measurement of flat or spherical surfaces and transmitted wavefront measurement of optical components.

   Cited variants

   Designation	Generation	Vintage	Changes	Source
   GPI XP/D	—	—	The GPI XP/D uses the precision of phase modulation for measurement; it is distinguished from the GPI FlashPhase which uses single-frame acquisition.	web.archive.org[1]

5. 

   GPI XP HR

   The Zygo GPI XP HR is a 4-inch interferometer configured with a Dell PC and Zygo MetroPro software running under Microsoft Windows NT.

Sources