Material: High grade quartz crystals.
Made of two multiple order waveplates with orthogonal
  optical axes. 
Mounted with the air space.
High damage threshold.
Large wavelength and temperature bandwidths.
Recommended for high power broadband applications.

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Air-spaced 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