+ 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. 

FZGFE 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:

 

Material

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.

Sapphire

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

MgF2

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

UV laser applications

 

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