Optical Filters are available in sets. Each set includes 95 optical filters contained in a wooden box. The filters are measuring 40x40 mm. Surface quality is pitch-polished, 80-50 Scratch and dig. The spectral specification for each optical filter accompanies the set.

Beam deviation £ 10arcsec
Anti-reflection coated


Standa manufactures Fresnel Rhombs and mounts for them. 10FR is a combination of a rhomb with a mount (see drawings). Fresnel Rhombs are made of BK7 crown glass or UV grade fused silica. A Single Fresnel Rhomb produces a phase shift of 90° (l/4) due to total internal reflections at two surfaces. A Double Fresnel Rhomb produces a phase shift of 180° (l/2) between the components of light polarised perpendicular and parallel to the plane of incidence. It consists of two optically contacted (or air spaced) single Fresnel l/4 Rhombs. The retardation varies only slightly over a relatively wide range of wavelengths. Fresnel Rhombs and mounts are adapted for use with any of Standa's positioning-rotation unit or units of other manufacturers which have appropriate mounting threads. The mount is cylindrical in shape. The end faces of a fresnel retarder are adjusted orthogonally to the axis of rotation. The clear aperture of the mount is 10 mm. The mount is made of black finish duralumin.

CRYSTALS
Amtir; Csl; GaAs; Si; MgF2; ZnS; Crystal Quartz;
CdTe; Ge; KRS-5; LiF; ZnSe; Sapphire; Fused Silica;

GROWN "IN HOUSE"
CaF2; BaF2; KBr; KCl; NaCl;

PRODUCTS
Windows
Lenses
Wedges
Mirrors
Beamsplitters
Assemblies

COATINGS
AR coatings on Ge,Si,ZnSe and ZnS
Custom AR and beamsplitter coating on CaF2, KRS-5, Sapphire and Quartz
Hard Carbon AR coating on Ge and Si
Reflection coating on mirrors
Protective coating on hydroscopic substrates KBr, NaCl, KCl

Prototypes, production and research quantities are available in custom and standard specifications.