Paraxial
This section provides an overview of the paraxial optics module in Optiland. This module enables the user to perform paraxial analysis of the optical system.
Conventions
Location quantities follow Optiland’s reference-surface convention, where object-space quantities are measured relative to the first physical surface (index 1) and image-space quantities relative to the image surface:
EPL()(entrance pupil location) is relative to the first physical surface (surface 1).XPL()(exit pupil location) is relative to the image surface.The focal, principal, nodal, and anti-nodal planes (
F1/F2,P1/P2,N1/N2,P1anti/P2anti,N1anti/N2anti) follow the same per-surface convention, where1denotes object space and2denotes image space.
When a global z coordinate is needed for the entrance pupil — for instance
to compare it against object or surface positions — use
entrance_pupil_z(), which converts EPL() to the
global frame in one place. Internally, every ray-aiming, ray-tracing, and
aperture consumer that mixes the pupil location with global coordinates routes
through this helper.
Paraxial Module |