Concave mirrors are used for focusing, collecting, and imaging with no chromatic aberration. They can be used to manipulate laser beams or broadband sources. λ/4 surface accuracy ensures excellent image quality and small focused spots. The Pyrex® substrates have low thermal expansion for high stability.
These mirrors are available in three sizes, 12.7, 25.4, and 50.8 mm diameter, with radii from 25–2000 mm. The focal length is equal to half the radius of curvature for concave mirrors. We offer three standard metallic coatings, covering the UV, visible, and IR.
Our AL.2 UV enhanced aluminum coating is a durable, broadband UV reflector with average reflectivity greater than 90% from 250–600 nm. The aluminum film is overcoated with UV transparent magnesium fluoride to prevent oxidation of the metal.
Our ER.1 enhanced aluminum coating may be used wherever a broadband visible and near infrared reflector is needed. A multilayer dielectric stack deposited over the aluminum film boosts reflectance and improves the durability of the coating. Average reflectivity is greater than 93% from 450–700 nm.
Our ER.2 protected silver coating is composed of a low emissivity silver film fully encapsulated by a multilayer dielectric stack to prevent oxidation. This coating has excellent broadband reflectivity in the IR, while maintaining very good performance in the visible and near IR. Average reflectivity is greater than 96% from 480–1100 nm and greater than 98.5% from 1.1–20 µm. |