| These are precision grade mirrors but not as expensive as the λ/10 versions. Used in many scientific instruments where quality is important but the use of the λ/10 versions cannot be justified. We stock ¼ wave plane mirrors in a wide range of coatings to meet most applications:
Enhanced aluminium coated precision mirrors for 94% reflectivity for use in visible applications.
99.9% coated precision grade dielectric mirrors for laser use in visible applications.
UV aluminium precision grade ¼ wave mirrors for use in UV applications down to 180nm.98.5% coated precision grade ¼ wave NIR dielectric coating mirrors for laser use in the near infra-red region. Ion plated protected silver precision grade ¼ wave mirrors for use in NIR to 2000nm.Protected gold precision grade ¼ wave mirrors for use from 750nm to far infra-red applications. Stock ¼ wave mirrors can also be edges to smaller diameters and other shapes at short notice. Specifications: | Material: | Soda lime float glass | | Diameter: | +0 / -0.2 mm | | Length/width: | ±0.1mm | | Thickness: | +0.1 / -0.3mm | | Surface quality: | <40:20 | | Flatness: | λ/4 over 90% of mirror dimension | | Parallelism: | <30 arcsec | | Coating: | UV aliminum / Al+MgF² / UV use MU1 Enhanced aluminium / Visible use MV1 Protected aluminium / Visible use MV2 All-dielectric 99% / Visible use MV99 Ion-plated silver / Visible&IR use MI1 All-dielectric 98% / IR use MI98 Protected gold / IR use MI2 | | 
Plane Mirrors - Precision Grade (Lambda/4)
