Overview: Calcium Fluoride (CaF2) Window is a popular choice for use
with excimer lasers with the feature of its low absorption
coefficient and high damage threshold. Star Optic offers either uncoated or with a broadband
anti-reflective coating for our Calcium fluoride (CaF2) windows.
The uncoated windows provide high transmission from the ultraviolet
(180 nm) to the infrared (8 μm). The AR-coated windows feature an
antireflection coating on both sides that provides increased
transmission within the 1.65 - 3.0 µm specified wavelength range. In dry environments, Calcium fluoride (CaF2) can be used up to 1000
°C, but in the presence of moisture, degradation will occur for
temperatures exceeding 600 °C. Each window has a randomly oriented
crystal axis. Calcium fluoride (CaF2) windows are also commonly used in
cryogenically cooled thermal imaging systems. General Specifications of Calcium Fluoride (CaF2) Window: | Material | Calcium Fluoride (CaF2) | | Wavefront Distortion | <λ@633nm per 25mm | | Surface Quality | 80/50 scratch-Dig | | Dimension Tolerance | +0/-0.2mm | | Thickness Tolerance | ±0.2mm | | Parallelism | <3 arc minutes | | Clear Aperture | >90% | | Chamfer | Protective<0.5mmx45° | | Coating | Uncoated, Upon request |
Standard Products of Calcium Fluoride (CaF2) Window: Part No. | Material | Dimension (mm) | Thickness (mm) | | CAW1201 | CaF2 | 12.7 | 1.0 | | CAW1203 | CaF2 | 12.7 | 3.0 | | CAW2003 | CaF2 | 20.0 | 3.0 | | CAW2005 | CaF2 | 20.0 | 5.0 | | CAW2501 | CaF2 | 25.4 | 1.0 | | CAW2502 | CaF2 | 25.4 | 2.0 | | CAW2503 | CaF2 | 25.4 | 3.0 | | CAW2505 | CaF2 | 25.4 | 5.0 | | CAW3003 | CaF2 | 30.0 | 3.0 | | CAW3005 | CaF2 | 30.0 | 5.0 | | CAW3803 | CaF2 | 38.1 | 3.0 | | CAW3805 | CaF2 | 38.1 | 5.0 | | CAW5003 | CaF2 | 50.8 | 3.0 | | CAW5005 | CaF2 | 50.8 | 5.0 |
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