Optical glass 2 - 5 μm Silicon (Si) Plano-Convex Spherical Lenses

Silicon (Si) Plano-Convex Lenses are available with a broadband AR coating optimized for the 2 µm to 5 μm spectral range deposited on both surfaces. This coating greatly reduces the surface reflectance of the substrate, yielding high transmission and minimal absorption over the entire AR coating range. See the Graphs tab for detailed information.

Silicon offers high thermal conductivity and low density. However, since it has a strong absorption band at 9 microns, it is not suitable for use with CO2 laser transmission applications.

f= R/(n-1),

Plano-Convex lenses have a positive focal length and approach best form for infinite and finite conjugate applications. These lenses focus a collimated beam to the back focus and collimate light from a point source. They are designed with minimal spherical aberration and have a focal length given by:

where R is the radius of curvature of the convex portion of the lens and n is the index of refraction.

Usage:
To minimize the introduction of spherical aberrations, light should be bent gradually as it propagates through the lens. Therefore, when using a plano-convex lens to focus a collimated light source, the collimated light should be incident on the curved surface. Similarly, when collimating a point source of light, the diverging light rays should be incident on the planar surface of the lens.

Map optics technology provides uncoated, coated anti - reflection film of double - concave mirror sheet.
Anti-reflection membrane options include UV, VIS, NIR, and SWIR.
Germanium, silicon, or zinc selenide substrates are suitable for infrared applications, while fused quartz is suitable for uv applications.