Windows

Photonchina’s windows are used to isolate different physical environments while allowing light to pass. When selecting windows you should consider materials, transmission, scattering, wavefront distortion, parallelism and resistance to certain environments.

We offer a wide range of different materials and different degree of precision windows. Special materials are available upon requirement.

A broad range of single layer or multilayer antireflective coatings on optical windows are available.

 

BK7 WINDOWS CAPABILITY

ATTRIBUTE STANDARD PREMIUM
MATERIAL BK7 grade A  optical glass
DIAMETER TOLERANCE +0.0, -0.2mm +0.0, -0.1mm
THICKNESS TOLERANCE ±0.1mm ±0.01mm
CLEAR APERTURE >80% >80%
PARALLELISM <1 arc minute <10 arc seconds
SURFACE QUALITY 40-20 scratch and dig 20-10 scratch and dig
WAVEFRONT DISTORTION λ/4 per 25mm @ 632.8nm λ/10 per 25mm @ 632.8nm
PROTECTIVE BEVEL 0.1 – 0.5mm 0.05 – 0.2mm

 

FUSED SILICA WINDOWS CAPABILITY

ATTRIBUTE STANDARD PREMIUM
MATERIAL UV grade Fused Silica UV grade Fused Silica
DIAMETER TOLERANCE +0.0, -0.2mm +0.0, -0.1mm
THICKNESS TOLERANCE ±0.1mm ±0.01mm
CLEAR APERTURE >80% >80%
PARALLELISM <1 arc minute <10 arc seconds
SURFACE QUALITY 40-20 scratch and dig 20-10 scratch and dig
WAVEFRONT DISTORTION λ/4 per 25mm @ 632.8nm λ/10 per 25mm @ 632.8nm
PROTECTIVE BEVEL 0.1 – 0.5mm 0.05 – 0.2mm
Higher flatness products are also available

 

CALCIDE FLUORIDE WINDOWS CAPABILITY

ATTRIBUTE STANDARD PREMIUM
CALCIUM FLUORIDE Transmission Range: 170-7800nm

Refractive Index: 1.399@ 5000nm

Little Hygroscopic Susceptibility

High Thermal Expansion Coefficient:

18.85 x 10-6K

It is applicable for wide range spectrum, and it is particularly useful for excimer (exciplex)  laser application.