Optical Windows are often used to create a physical barrier between two different environments – preventing two gases from mixing together, separating liquids from air, keeping a sealed system in vacuum. In many optical systems, a window is used to protect more expensive optical components (within an assembly) from back-splatter, out-gassing or other possible damage.

While it can take nearly any form, most windows are either round or rectangular in shape. All windows are fabricated from optically transparent material, with two flat (or plano) polished surfaces.

Your One-Stop Source for Optical Flats & Windows

From prototype to production, Rainbow Research Optics, Inc. (RROI) manufactures and delivers precision grade and commercial quality windows to address applications in the ultraviolet (UV), visible, and infrared (IR) wavelength ranges.

Check mark symbol Standard and specialty materials
Check mark symbol In-house fabrication, polishing, and coating
Check mark symbol Stock inventory

Quick find: • Plane WindowsParallel Windows • Interferometer Flats • Large Wedge Windows • Square WindowsRectangular WindowsElliptical WindowsBrewster Windows

STANDARD & CUSTOM WINDOWS

Plane Windows – Wedge < 3 min.  (part code: WI)
Substrate: VUV MgF2, CaF2 (VUV), Caf2 (IR), SUPRASIL 1, Sapphire, Silicon, Germanium, Zinc Selenide, or Zinc Sulfide
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Transmitted Wavefront: measure at 633 nm
Wedge: < 3 arc min.
Clear Aperture: > 85% of diameter
Edge Bevel: 0.3 mm face width at 45°
Parallel Windows – Wedge < 10 sec. (part code: PW)
Substrate: VUV MgF2, CaF2 (VUV), Caf2 (IR), SUPRASIL 1, Sapphire, Silicon, Germanium, Zinc Selenide, or Zinc Sulfide
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Transmitted Wavefront: measure at 633 nm
Wedge: < 10 arc min.
Clear Aperture: > 85% of diameter
Edge Bevel: 0.3 mm face width at 45°
Interferometer Flats – Wedge 30 ± 5 min. (part code: IF)
Substrate: SUPRASIL 1, UV Fused Silica, or BK7
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Surface Flatness: λ/10 @ 633 nm 
Surface Quality: 10-5 laser quality
Wedge: 30 ± 5 arc min.
Clear Aperture: > 85% of diameter
Edge Bevel: 0.3 mm face width at 45°
Large Wedge Windows – 1°, 2°, and 3° (part code: WW)
Substrate: UV Fused Silica, or BK7
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Surface Flatness: λ/10 @ 633 nm 
Surface Quality: 10-5 laser quality
Wedge: 30 ± 6 arc min.
Clear Aperture: > 85% of diameter
Edge Bevel: 0.3 mm face width at 45°
Square Windows (part code: SW)
Substrate: UV Fused Silica, or BK7
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Surface Flatness: measure at 633 nm 
Surface Quality: 10-5 laser quality
Wedge: < 3 arc min.
Clear Aperture: > 85% of diameter
Edge Bevel: 0.3 mm face width at 45°
Rectangular Windows (part code: RW)
Substrate: UV Fused Silica, or BK7
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Surface Flatness: measure at 633 nm 
Surface Quality: 10-5 laser quality
Wedge: < 3 arc min.
Clear Aperture: > 85% of diameter
Edge Bevel: 0.3 mm face width at 45°
Elliptical Windows (part code: EW)
Substrate: UV Fused Silica, or BK7
Diameter Tolerance:
+ 0.0/-0.20 mm
Thickness Tolerance:
± 0.25 mm
Surface Flatness:
λ/10 @ 633 nm 
Surface Quality:
10-5 laser quality
Wedge:
< 3 arc min.
Clear Aperture:
> 85% of diameter
Edge Bevel:
0.3 mm face width at 45°
Brewster Windows (part code: BW)
Substrate: SUPRASIL 1 or UV Fused Silica
Diameter Tolerance:
+ 0.0/-0.20 mm
Thickness Tolerance:
± 0.25 mm
Surface Flatness:
λ/10 @ 633 nm 
Surface Quality:
10-5 laser quality
Wedge:
< 3 arc min.
Clear Aperture:
> 85% of diameter
Edge Bevel:
0.3 mm face width at 45°

 Rainbow Research Optics, Inc (RROI) is ISO 9001:2015 Certified and ITAR Registered