CaF2 Plano-Convex Lenses, AR1.65-3μm
Calcium fluoride is widely used in applications requiring high transmittance across both ultraviolet and infrared spectral ranges. It features an extremely high laser damage threshold, making it suitable for excimer laser systems. With a low refractive index ranging from 1.35 to 1.51 within its operating bandwidth of 180 nm to 8000 nm, calcium fluoride also exhibits excellent chemical inertness. Compared with similar fluoride materials such as barium fluoride, magnesium fluoride and lithium fluoride, it delivers superior hardness.
Tuniu Optics supplies plano-convex lenses with a diameter of 25.4 mm. Uncoated versions feature a broad working spectrum and high damage threshold, while anti-reflection coated options are available for the 1650–3000 nm band. The AR coating effectively reduces surface reflection to an average single-surface reflectance below 1%, greatly improving optical transmittance. Custom specifications are available upon request.
Parameters
| Optical material | CaF2 | Diameter | 25.4 mm |
| Clear aperture | > 90% of Outer Diameter | Working wavelength | 1650-3000 nm |
| Abbe | 95.00 | Design wavelength | 587.6 nm |
| Refractive index | 1.434 | Coating | Anti-reflective coating |
| Anti-reflective coating | Ravg < 1%@1650-3000 nm, | Diameter tolerance | + 0.0/ -0.1 mm |
| Thickness tolerance | ± 0.1 mm | Focal length tolerance | ± 1% |
| Eccentricity | < 3 arcmin | Face PV value | < λ/2 |
| Number of spherical aperture | 3 | Surface smoothness (scratches/pitting) | 40/20 |
| Surface flatness (@633 nm) | < λ/2 | ||
Model
CaF2 Plano-Convex Lenses, AR1650-3000nm, Mounted in SM1 Lens Tube/Unmounted
| Dia., mm | Focal Length, mm |
| 25.4 | 40.0/50.0/75.0/100.0/150.0/200.0/250.0/500.0/750.0/1000.0 |