Ray Directions - Focus to / from two astigmatic focii

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Focus to/from Two Astigmatic Focii

Page Contents

Description

The Focus to/from Two Astigmatic Focii option generates a bundle of rays from the defined ray positions with different X and Y axis focal points. The phase function for this direction specification is:

Note that phase function above is a parabolic wavefront and therefore rays do not come to perfect focus at the specified focal points. Three views of an astigmatic focii definition are shown below.

Navigation

This feature can be accessed by select Focus to / from two astigmatic focii as the ray direction type on the Positions/Directions tab of a detailed source dialog box.

Controls

Control	Inputs / Description	Defaults
Ray Directions
Type	Drop down menu of ray direction types. Select Focus to/from Two Astigmatic Focii.	Single Direction (plane wave)
Parameters
Z1 (sag)	Z-position of the sagittal, or X axis, focus in system units.	1
Z2 (tan)	Z-position of the tangential, or Y axis, focus in system units.	1.1
Direction	Rays can be directed towards or away from the sagittal or X axis focus.	Towards

OK	Accept settings and close dialog box.
Cancel	Discard settings and close dialog box.
Help	Access this Help page.