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| Coad | 668491 | Substrate | CaF2 | |
| Type | Plano-Convex Lenses | Clear Aperture | 90% CA | |
| Diameter(mm) | 25.40 | Diameter Tolerance | +0/-0.1mm | |
| Thickness(mm) | 2.00 | Thickness Tolerance | +0/-0.1mm | |
| Center Thickness | 2.2mm | Parallelism | ≤3 arcmin | |
| Wavelength(nm) | 1650 - 3000 | Surface Quality | 40-20 | |
| Focal Length(mm) | 750.00 | Focal Length Tolerance | ±1% | |
| Radius of Curvature | 325.4mm | Back Focal Length | 748.4mm | |
| Sagittal Aperture | 0.5 | Aperture on Curved Surface | 3 | |
| Surface Irregularity | λ/2@633 nm | Laser Damage Threshold | - | |
| Coating Type | Anti-Reflective Coating | Mechanical Housing | SM1-8A（Lens sleeve with SM1 internal and external threads） | |
| Coating Specifications | Ravg<0.5%a@1650-3000nm | |||
A plano-convex lens has one convex surface and one flat surface, providing a positive focal length. It is typically used to reduce beam size, decrease focal length, or magnify images. To minimize spherical aberration, the plano-convex lens should be oriented so that the curved surface faces the incoming collimated beam when focusing, while the flat surface faces the point source when collimating. LBTEK CaF₂ plano-convex lenses are coated on both surfaces with an anti-reflection (AR) coating for 1.65–3 μm, reducing surface reflectance. LBTEK selects calcium fluoride (CaF₂) for manufacturing a wide range of lenses. CaF₂ offers high transmission in both the ultraviolet and infrared spectral ranges and features an exceptionally high damage threshold, making it widely used in the excimer laser industry. Calcium fluoride (CaF₂) has a relatively low refractive index, ranging from 1.35 to 1.51 across the 180 nm–8.0 µm spectral range. It also exhibits excellent chemical inertness compared to similar materials such as barium fluoride (BaF₂) and magnesium fluoride (MgF₂). In addition, CaF₂ possesses high hardness, making it an ideal material for lenses used in both the ultraviolet and infrared spectral regions.
Plano-convex lenses are typically used to reduce beam size, decrease focal length, or magnify images. LBTEK manufactures a variety of lenses using CaF₂, which provides high transmission in both the ultraviolet and infrared spectral ranges, along with an exceptionally high damage threshold, making it widely used in the excimer laser industry. All LBTEK circular lenses are pre-installed in standard lens tubes or lens adapter mounts. The surfaces of these mechanical housings are engraved with the product model, type, diameter, and focal length, enabling users to quickly and easily identify lens specifications.
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