Material: High grade quartz crystals.
Made of two multiple order waveplates with orthogonal
  optical axes. 
Optically contacted with high transparency. No optical
  cement in beam path.
Large wavelength and temperature bandwidths.
  Suitable for medium to high power broadband applications
  in visible and infrared.

  Learn more about waveplates ...

Optically Contacted Waveplate Specifications

Dimensions Tolerance: +/- 0.1 mm
Wavefront Distortion: < λ/8 @632.8nm
Retardation Tolerance: < λ/300
Surface Quality: 20-10 scratch and dig
Coating: AR coating with R < 0.2% at the center wavelength
Holder: Anodized aluminum holder

Structure and
the optical axes