This article has discussed how to design afocal systems in ZEMAX. The main points are:

• The major difference between focal and afocal systems is that focal systems are measured in spatial units and afocal systems are measured in angular units
• The Afocal Image Space switch switches ZEMAX from using spatial units to angular units where appropriate
• The default merit function tool allows you to easily target both spatial and angular properties of the beam
• The IMSF operand allows you to target spatial properties at one surface, and angular properties at another (for example) to control both focal and afocal properties of the optical system at any surface
• The AFOC multi-configuration operand lets you define focal and afocal configurations of a design.
• The ZPL keywords GETSYSTEMDATA and SETSYSTEMPROPERTY allow control of the Afocal Image Space switch from within a ZPL macro

References

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