Hi,
I'm using the non-squential component editor and trying to create a window with a central hole using the Annular Axial Lens. The outside semi-diameter is 18mm and the hole semi-diameter is 1.5mm. It's not clear from the manual how the parameters Aperture, Revolution and (possibly) Decentre relate to these diameters. I have tried every combination of the numbers 1.5, 18 and 16.5 (the difference) in those parameters and none produce the desired result.
Thanks for any help.
Hi Nick,
The annular axial lens is defined by sweeping the cross section of a bi-aspheric lens around a decentered axis parallel to the axis of symmetry of the cross section. So you will need to set the radial aperture of the cross section as (18-1.5)/2 =8.25 and the revolution parameter ( the radius of rotation from the local Z axis to the axis of symmetry of the cross section) as 8.25+1.5= 9.75:
To model a lens with a hole it's probably easier to use two lenses and use the nesting rule (If a ray strikes more than one object at the exact same point in space; the last object listed in the NSC Editor determines the properties of the surface or volume at that point.) You can check a sample file (lens with hole.zmx) in the folder \Zemax\Samples\Non-sequential\Miscellaneous
Best,
Berta
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