Compare Model Drawings, CAD & Specs Diameter Antireflection Coating Material Surface Quality Angle of Incidence Availability Price
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25.4 mm Uncoated Calcium Fluoride 60-40 scratch-dig 45°
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38.1 mm Uncoated Calcium Fluoride 60-40 scratch-dig 45°
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50.8 mm Uncoated Calcium Fluoride 60-40 scratch-dig 45°
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25.4 mm 7000-14000 nm Zinc Selenide 60-40 scratch-dig 45°±3°
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Calcium Fluoride Substrates

CaF2 beamsplitters are an ideal material for applications in the IR region. In general, CaF2 has a transmission above 90% between 0.25 µm and 7 µm, making it a great choice for deep UV to infrared applications. In addition, with its low absorption and high damage threshold, CaF2 is commonly used for excimer laser applications.

Zinc Selenide Substrates

ZnSe is the one of the preferred substrates for IR applications in the 7 µm to 14 µm range. Zinc Selenide offers low IR absorption, and high resistance to thermal shock. However, windows must be handled with caution due to material's softness. The zinc selenide optics are coated with an antireflection coated on the back surface.

Deep UV to IR Applications

Calcium Fluoride is transparent in the UV and Visible wavelength ranges, making it suitable for applications such as fluorescence imaging or spectroscopy where operation over many wavelength bands is essential. Compared to most IR materials, Calcium Fluoride has both high average transmission and low chromatic aberration.

Zinc Selenide Properties

Zinc Selenide has low IR absorption, and is transparent across a very wide spectral range (0.6-16 µm uncoated). This is advantageous for thermal imaging, where temperatures of remote objects are ascertained via their blackbody radiation spectrum. Long wavelength transparency is crucial for imaging room temperature objects, which radiate at peak wavelength of approximately 10 µm with very low intensity. The combination of low IR absorption and low thermal coefficient makes ZnSe a candidate for use in high power CO2 laser applications.

Handle with Caution

Zinc Selenide material formed to with extremely high purity by molecular beam epitaxy. Zinc selenide is a soft material, making it resilient and tolerant of thermal shock. However, this means that great care must be taken in handling and cleaning the material to prevent scratches. Zinc Selenide should handled only by the edges. Rubber gloves should be worn at all times as Zinc Selenide is toxic.