Greyhawk Optics offers optical elements made of high quality synthetically 
grown Rutile Titanium Dioxide crystals. Rutile’s strong birefringency, wide 
transmission range and good mechanical properties make it suitable for 
fabrication of polarizing cubes, prisms and optical isolators. Boules having 
high optical transmission and homogenity are grown by proprietary method. 
Typical boules have 10 - 15 mm in dia. and up to 25 mm length. Optical elements 
sizes - from 2 x 2 x 1 mm to 12.7 x 12.7 x 12.7 mm. Laser grade polish quality 
is available for finished elements. So far we the largest elements that we 
manufactured are
12 x15 x 5 mm, in which optical axis is parallel to 15 mm edge, 5 mm is
along
beam path, 12 x 15 mm faces polished 20/10 S/D, one wave flatness,
parallelism < 3 arc.min. (better specs. available on request).
 
Standard Specifications (buy online):
Rutile (TiO2) coupling prism
    Material: single crystal TiO2 
    Sizes: 5x5x5 mm +/- 0.2 mm
    Angles:45-45-90 deg.+/-10 arcmin
    Polish quality: 20/10Scratch/Dig
    Surface flatness: lambda @ 633nm
    Parallelism: <5arcmins
    Orientation: Z-axis along prism thickness +/- 15 arcmin