Zygo GPI

Models in this family

1. 

   GPI
2. 

   GPI 4'' XP 512
3. 

   GPI to Verifire
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