CALCIUM FLUORIDE CaF2 WINDOWS
Description
Calcium Fluoride is good choice for optical windows in the 0.15 μm - 9 μm range,which is relatively soft and somewhat hygroscopic so polishing, coating and handling are more critical than UV Fused Silica windows. In addition, The quality of a UV window can be extremely critical, it should be of high purity and polish in order not to affect the optical system. Calcium Fluoride Windows are also applicable for a wide range of spectrum. It is particularly useful for wavelength at 2980nm laser application. Due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating.
CALCIUM FLUORIDE CaF2 WINDOWS
Specifications |
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|---|---|
| Substrate Material: | CaF2 |
| Antireflection Coating: | Coated |
| Diameter: | 8.0 mm |
| Surface Quality: | 40-20 scratch-dig |
| Surface Flatness: | lambda/4 |
| Thickness: | 0.5 mm |
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Frequently Asked Questions
Yes, due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating.
The available sizes for Calcium Fluoride windows are: 8.0mm, 12.7mm, 15.0mm, 25.4mm, 38.10mm, and 50.0mm.
The standard specifications for Calcium Fluoride windows are: Optical Material: Calcium Fluoride Single Crystal, Diameter Tolerance: +0.0, -0.1mm, Thickness Tolerance: ± 0.2mm, Clear Aperture: >85%, Parallelism: <3 arc minutes, Surface Quality: see the table, Wavefront Distortion: <0.25mm X 45°, Bevel: available upon request, Coating: Standard CaF2 Windows.
Calcium Fluoride is a material that is a good choice for optical windows in the 0.15 μm - 9 μm range. It is relatively soft and somewhat hygroscopic, so polishing, coating, and handling are more critical than UV Fused Silica windows. It is particularly useful for wavelength at 2980nm laser application.
Calcium Fluoride crystals are soft and susceptible to cracking, as well as cleavage if subjected to rapid changes in temperature. They should be handled accordingly. Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.