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March 23, 2017

The Insulator Seal division of MDC Vacuum Products, LLC recently collaborated with a global technology company to manufacture polarization preserving optical viewports.

UHV Re-Entrant Polarization Preserving Optical Viewports - 3 web - ISI Insulator Seal

Experimental vacuum techniques based the state of polarization and correlated with changes to chemical and physical states require that the light entering or exiting an apparatus preserve the state of polarization. Stress induced birefringence in viewports rotate circularly polarized light and should be avoided in such applications as magneto-optical-Kerr-effect (MOKE) experiments, Bose-Einstein Condensate apparatus (BEC) and in the monitoring of molecular beam epitaxy (MBE) by ellipsometry methods.

ISI P/N: 1349101

UHV Re-Entrant Polarization Preserving Optical Viewports - 4 web - ISI Insulator Seal


  • AR coated – R < 0.25% per surface @ 397nm
  • Low strain – λ/10 TWD @ 632nm
  • Re-entrant – ~ 1.854 inches from flange face

UHV Re-Entrant Polarization Preserving Optical Viewports - 2 web - ISI Insulator Seal


  • UHV – 316 Stainless steel
  • DUV Fused Silica – 20-10 Scratch-Dig

Insulator Seal Inc. (ISI™), a division of MDC Vacuum Products, LLC, manufactures electrical & optical ceramic-to-metal sealed components for harsh environments. ISI has been the innovation leader in the industry for over 30 years. Evolving from being a high vacuum solutions provider only, ISI now delivers world-class components for harsh environmental connector applications around the globe.

We have eight generic product classes used to create innovative solutions for our markets. They are Viewport, Break, Liquid, RF Power, Thermocouple, Power, Multipin, and Coaxial. Each product has its own defined value in the transmission of energy, light, and fluid between a harsh environment to the ambient system. Regardless of your industry or application, Insulator Seal can provide you with the connector solution you require in order to drive your process forward.