Attribute

Commercial standard

Precision Standard

Material

BK7, fine annealed

BK7, fine annealed

Beam Deflection

180° ± 3°, 180°± 1°

180° ± 30', 180°±5'

Dimensional Tolerance

+/-0.25mm

+/- 0.15 mm

Angles Tolerance

90°±3° or ±1°

90° ±30' or ±5'

Flatness

λ/2

λ/4, λ/10

Cosmetics (Scratch-dig)

80-50, 60-40

20-10, 10-5

Edges

Fine ground and beveled

Fine ground and beveled

Clear Aperture

90% Reflecting

90% Reflecting

Coating

See attached coating chapter.

See attached coating chapter.

          All dimensions are in mm unless otherwise specified.

          Different material, sizes, tolerance and coating              are available upon request.