WGF™ PBS — Polarized Beam Splitter

With the WGF PBS, users can order glasses in a variety of sizes, such as 40 mm or 50 mm, and choose glasses with a refractive index that matches the specific equipment. It is now used in optical devices including substrate inspection equipment and AR Glasses. It is useful in a wide range of wavelength not only VIS but also Infrared (IR) .

Image Credit: Asahi Kasei Corporation

Inspection equipment performs better when its optical performance is stable with regard to the angle of incidence.

PBS with WGF is a polarizing beam splitter with steady optical performance across a large AOI range. WGF is film-based wire grid polarizer and WGFPBS is manufacttured by sandwiching structure with a couple of prisms and WGF . Color and polarization do not change partially even in the optical system with reducing lenses, which is expected when it comes to boosting imaging inspection quality. If the user is currently utilizing a half mirror, replacing it with WGF PBS will boost the brightness.

  • WGF PBS is available in a wide variety of sizes up to around 50 mm. There are talks ongoing to make a 1-inch PBS model a standard
  • It is possible to pick glass with a refractive index that corresponds to the equipment
  • Substrate inspection equipment is being employed
  • Make sure to contact the company for information regarding further specs, like four-sided AR

Sandwich structure with a couple of prisms and WGFand WGFPBS.

Image Credit: Asahi Kasei Corporation

* These data are reference values

Image Credit: Asahi Kasei Corporation

AR Glasses on the market now employ LCOS displays, which structutally require PBS. Many customers have utilized PBS with WGF for years as it delivers consistent optical performance across a wide range of AOI.

PBS, Polarization Beam Splitter for Coaxial Epi-Illumination Inspection Machines

Optical Stability for Wide AOI, Angle of Incidence

PBS with WGF is a polarizing beam splitter with steady optical performance across a large AOI range. Even in an optical system with reducing lenses, polarization and color do not change partially, which can be predicted to increase imaging inspection quality. If the user is currently utilizing a half mirror, replacing it with WGF PBS will result in a brighter image.

 

Coaxial epi-illumination system optical system and PBS.

Image Credit: Asahi Kasei Corporation

PBS, Polarizing Beam Splitter for AR Glasses

The majority of AR-glasses on the market today uses LCOS, which necessitates the use of a PBS, or Polarizing Beam Splitter. Less oblique incident angle dependency and WGF flatness result in optically acceptable PBS. PBS by Asahi Kasei Corporation has been on the market since the introduction of AR glasses.

Flexibility of PBS Size, Material, and Other Specs

  • For years, WGF PBS has been used in inspection machines
  • Other features, such as a four-sided AR coating, are also available
  • While most beam splitters are 5 to 25 mm or 1 inch in diameter, WGF PBS can be made in whatever size the user chooses, even 50 mm or larger
  • Users can select the refractive index of glass that best fits their equipment   

 

This information has been sourced, reviewed and adapted from materials provided by Asahi Kasei Corporation.

For more information on this source, please visit Asahi Kasei Corporation.

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