Table 11. Diffraction-limited (Strehl > 80%) 1:1 optical relay using two Newport 50329AU 90° off-axis parabolic mirrors with 25.4 mm parent parabola focal length as a function of beam aperture. Calculations were done using Zemax optical modeling software.

1/e2 beam aperture (mm)	3	4	5	6
Strehl ratio (%)*	100	99.9	99.5	97.8
optimal distance (mm) †	152.441	152.474	152.516	152.568

* at infinity and 1000 nm, † between parabola vertices