Attribute

Specification

Material

Crystal Quartz&MgF2

Typical Diameter (Φmm)

10.0, 12.7, 15.0, 20.0

Diameter Tolerance (mm)

+0.0/-0.2

Wavefront Distortion

λ/4@633nm

Retardation

λ/2 and λ/4

Retardation Tolerance

<λ/100 over wavelength range

Parallelism

<3arc second.(General) , <1 arc second. (High Precision)

Surface Quality

40/20

Clear Aperture

Central 90%

Coating

<0.5% @wavelength range