ZnSe Focusing Lens
ZnSe Focusing Lens ZnSe Plano-Convex Lenses (LZ) has a positive focal length and are used to focus a collimated beam to small spot size. ZnSe Plano-Concave (LZ) lenses have a negative focal length and are used for diverging collimated beams. The curved surfaces of these lenses should face the source to minimize spherical aberration. Positive Meniscus Convex-Concave (LZM) Lenses are converging lenses being thick at the center and thin at the edges and produce real images. The radius of the curvature of the concave side is greater than the convex side of the lens. The convex side of the lens should face the source to minimize spherical aberration. It is designed to minimize spherical aberration and produce minimum focal spot size for incoming collimated light.
Diameter Tolerance: +0/-0.13mm
Thickness Tolerance: ±0.25mm
Focal Length Tolerance: ±2%
Edge Thickness Variation (ETV): ≤3 arc min.
Clear Aperture: >90%
Surface Flatness: λ/4 per 1″ Dia@632.8nm
Surface Quality: 40-20 S-DAR
Coating: R<0.2% per surface @10.6μm