The item comes from an US
Space/Military research company specializing in MIR and LWIR (Participator in
the moon rover development (Spirit)).
What you receive is what is shown in
the pictures. If it’s not in the pictures, it’s not included. The manufacturer
is Edmund Scientific.
Product Specifications from Edmund Scientific:
Product Code: #32-090
Wavelength Range: 700 - 10000 nm
Coating: Protected Gold
Reflectance: > 96% (700 - 2000
nm, Average) > 96% (2000 - 10000 nm, Average)
Diameter: 57.15
mm (2.25", Minor Axis) - 80.82 mm (Major Axis)
Dimensions: Ø 57.15
mm (2.25")
Thickness: 15.88
mm
Clear Aperture: 51.44
mm, 72.75 mm
Damage Threshold Pulsed: 0.8 J/cm2 (10
ns, 1064 nm)
Major Axis: 80.82
mm
Minor Axis: 57.15
mm
Shape: Elliptical
Substrate: Borofloat
Surface Irregularity: λ/8 (Flatness)
Surface Quality: 60-40 scratch-dig
Thickness Tolerance: ±1.016 mm
(0.04")