Calcium fluoride (CaF2) has high transmittance from ultraviolet to mid infrared (250nm ~ 7um), so it is widely used in the manufacture of prisms, windows and lenses. In some applications with a wide spectral range, it can be used directly without coating, especially with small absorption and high laser threshold. It is very suitable for excimer laser optical system. The diameter range of calcium fluoride (CaF2) lens or window produced by our company is 5 ~ 150mm, the surface accuracy can usually reach 40 / 20, and the surface flatness can reach: λ/ 10@633nm (the ratio of lens thickness to diameter shall conform to the processing proportion).
Material: K9, BK7, FS, UVFS, CaF₂, ZnSe
Diameter:3mm-200mm±0.05mm
Center Thickness Tolerance:±0.05mm
Lens Alignment Error:≤3min
Surface Accuracy:λ/ 10 @
Surface Quality:40/20. 60/40. 80/60
Effective Caliber: 90%
Example with BK7 material：These N-BK7 biconvex lenses are available uncoated or with one of five antireflection coatings (-A, -AB, -B, -C, or -D), which reduces the amount of light reflected from each surface of the lens (see the Selection Guide table below for coating option). Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of an AR coating improves transmission, which is important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections. Having optics that are AR coated on both surfaces is particularly desirable for applications utilizing multiple optical elements. Please see the Graphs tab for additional coating information.
| N-BK7 Double- Convex Lens Selection Guide | 
|
| Coating name | wavelength band |
| Uncoated | Uncoated |
| A Coating | 350nm-700nm |
| AB Coating | 400nm-1100nm |
| B Coating | 650nm-1050nm |
| C Coating | 1050-1700nm |
| D Coating | 1650nm-3000nm |
Other series products：
Concave Lens Achromatic Lens Ball Lens Silicon Window Zinc Selenide Window Wedge Optical Window
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