ALKOR Technologies - your CRYSTAL optics supplier.   ALKOR Technologies - your CRYSTAL optics supplier.
ALKOR Technologies - your CRYSTAL optics supplier.

Material selection guide. UV and Infrared optical materials.

Alkor Technologies manufactures optical components made of the Infrared materials, crystals and Fused Silica. Our materials cover the entire spectral range from the UV through Far Infrared.

Crystal Transmission band, m Index of refraction (nd) Abbe Number (vd) Density (g/cm3) Softening Temperature Knoop Hardness Diameter range, mm Thickness range, mm
BaF2 0.2-10 1.474 4.89 1550 82 4-220 0.4 - 50
KBr 0.25-20 1.527 33.6 2.75 730 7 5-101.6 0.5-80
Fused Silica 0.2-3 1.458 67.7 2.21 1000 500 4-300 0.3-100
CaF2 0.15-10 1.434 95.1 3.18 800 158.3 4-220 0.4-50
NaCl 0.3-15 1.491 42.9 2.17 801 18.2 4-200 1-50
MgF2 0.12-7 1.413 106.2 3.18 1255 415 4-50.8 0.4-50
LiF 0.12-5 1.391 3.18 867 100 4-76.2 0.4-20
ZnSe 0.6-20 2.403 N/A 5.27 250 120 4-80 0.5-30
Silicon 1.2-8 3.422 N/A 2.33 1500 1150 4-140 0.4-50
Germanium 2-16 4.003 N/A 5.32 936 780 4-180 0.4-50
Sapphire 0.3-4 1.768 72.2 3.98 2273 2200 4-200 0.5-20
KCl 0.3-18 1.49 1.98 776 7.2 4-200 1-50
Optical glasses visible 4-300 0.4-50


Alkor Technologies provides a range of high quality custom infrared optical components specifically suited to infrared wavelengths for a host of IR applications. A range of materials are available for use from 2.6m to 45m, however some materials such as Lithium Fluoride, Calcium Fluoride and Magnesium Fluoride work efficiently in deep UV and other materials such as low OH IR fused quartz is also suited to visible and NIR spectrums.

Our high quality Infrared optical components that are available as custom solutions include windows, prisms, spherical, meniscus and diamond turned lenses and ground blanks. We also provide custom solutions for a range of IR optical filters, IR polarisers, IR beamsplitters and IR gas cells.

Size tolerance,mm Parallelism Flatness Surface quality
Standard +0, -0.2 3 arc. min 1 lambda at 0.63m 60/40
Achievable +0, -0.02 10 arc.sec Lambda/10 at 0.63 m 10/5