< Backlitetec optics

 

WINDOWS

Optical Windows are applied to isolate different physical environments while allowing light to pass. When selecting windows you should consider materials, transmission, scattering, wavefront distortion, parallelism and resistnace to certain environments.Single layer or multilayer anti-reflecting coatings on optical windows are available upon request.

 

Material Properties Application
BK7

 

Transmission Range; 330-2100nm.

Refractive Index: 1.5164@588nm

Good performance over visible and near IR specrum for most applications
Fused Silica

 

Transmission Range; 185-2500nm

Refractive Index: 1.4858@308nm

Low Thermal Expansion Coefficient: 0.54 x 10- 6K

Better performance from UV to IR spectrum. It is also the best choice for thermal resistance.
Sapphire

 

Transmission Range; 180-4500nm

Refractive Index: 1.755@1000nm

Strong Hardness

Suitable for scratch resistance applications with better transmission over the wide range spectrum. Can be made thinner if necessary
Calcium Fluoride

 

Transmission Range; 170-7800nm

Refractive Index: 1.399@5000nm

Little Hydroscopic Susceptability

High Thermal Expansion

Coefficient: 18.85 x 10-6K

Applications for a wide range spectrum and is particularly useful for IR laser applications.