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Window Materials

ARS cryostats are available with a large selection of optical windows for UV, VIS, and IR experiments.

  • UV - 0.1 to 0.3 µm (100 to 300 nm)
  • VIS - 0.3 to 1 µm (300 to 1000 nm)
  • IR - 1 µm and beyond (1000 nm)

Custom window materials available upon request.

High Purity Quartz (SiO2)

High Purity Quarts Transmission Curve

Unaffected by most solvents, useful range 250-2500 nm (GE124).


Calcium Fluoride (CaF2)

Calcium Fluoride Transmission Curve

Insoluble in water, does not fog.


Cesium Iodide (CsI)

Cesium Iodide Transmission Curve

Soluble in water, extremely hygroscopic.


Fused Silica - IR Grade

IR Grade Fused Silica Transmission Curve

Synthetic quartz, unaffected by most solvents.


Fused Silica - UV Grade

UV Grade Fused Silica Transmission Curve

Synthetic quartz, unaffected by most solvents.


Potassium Chloride (KCl)

Potassium Chloride Transmission Curve

Hygroscopic, slightly soluble.


Potassium Bromide (KBr)

Potassium Bromide Transmission Curve

Hygroscopic, soluble in water.
Good resistance to mechanical and thermal shock.


Sapphire (Al2O3)

Sapphire Transmission Curve

Hardest and most inert material.
Recommended for cold windows.


Thallium Bromoiodide (KRS-5)

Thallium Bromoiodide Transmission Curve

Not hygroscopic, slightly soluble in water. Soft, easily deformed.


Zinc Selenide (ZnSe)

Zinc Selenide Transmission Curve

Laser grade. Insoluble in water, acids and bases.


Zinc Sulphide (ZnS)

Zinc Sulphide Transmission Curve

Insoluble in water, acids, and bases. Reacts to strong oxidizing agents. Good resistance to thermal and mechanical shock.


Picarin and Polyethylene

Transmission Curves of Picarin and Polyethylene

For terrahertz spectroscopy applications.