Optical Windows

Optics >>> Optical Windows

Windows are optical glass with ground and polished faces that are relatively parallel.  They are used to isolate two physical environments while allowing light to pass. When selecting windows, you should consider the following: material, transmission, scattering, wave front distortion, parallelism and resistance to certain environment. 

Red Optronics offers all types of windows made from different materials. Special size and materials are also available upon request. In addition, we provide a variety of single layer or multiplayer anti-reflecting coating on optical windows.  Please refer to coating chapter for more information.

Window Materials and Properties:


Properties Applications
BK7 Transmission Range: 330-2100nm

Refractive Index: 1.5164@588nm
  • Most popular and low cost

  • Visible and near IR spectrum applications

Fused Silica Transmission Range: 185-2500nm

Refractive Index: 1.4858@308nm

Low Thermal Expansion Coefficient: 0.54 x 10-6K
  • UV to IR spectrum

  • Best choice for thermal resistance application.


Transmission Range: 180-4500nm

Refractive Index: 1.755@1000nm

Strong Hardness

  • Best choice for scratch resistance applications 

  • Thinner optics

  • Wide Transmission Range

Calcium Fluoride

Transmission Range: 170-7800nm
Refractive Index: 1.399@5000nm
Little Hygroscopic Susceptibility
High Thermal Expansion Coefficient: 18.85 x 10-6K

IR laser applications


Transmission Range: 120-7000nm
Refractive Index: 1.376@700nm

UV laser applications



Toll Free(U.S.) 888.309.5061 Fax 650.618.2057


Copyright 2010 Red Optronics.  All Rights Reserved.