
Using the Geometrical enclosed energy plot
The GEE plot is a plot of the enclosed (encircled or ensquared) energy versus radius from the the spot centroid.
To create a GEE window:
- Select from the menu Analysis > Energy > GEE
- To select encircled or ensquared, press the Options button to get the options panel and select using the Ensquared checkbox.
Options panel

- Field
- Using the Field popup menu, select the field for which you wish to calculate. Select All to calculate for all fields (this can be time-consuming if combined with all waves).
- Wave
- Using the Wave popup menu, select the wave for which you wish to calculate. Select All to calculate for all waves (this can be time-consuming if combined with all fields).
- Pattern
- The pattern of waves in the pupil. Only area-filling patterns are available.
- Number of rays
- For each field and for each wave, the pupil is sampled using N rays distributed according to the selected pattern.
- Color by
- How to color the curves for identification.
- Paraxial trace
- If checked, all rays are traced paraxially.
- Subtract centroid
- If checked, the centroid of the spot is used as a reference. Otherwise the chief ray is used as a reference. This is done on a per field, per wave basis.
- Divide by focal length
- If checked the radius is given in terms of object-space angle by dividing by the focal length.
- Afocal analysis
- If checked the ray direction (momentum) is used instead of ray position.
- Ensquared
- If checked the ensquared energy is calculated. If not checked the encircled energy is calculated.
- Maximum radius
- To specify the maximum radius from the reference point to be shown in the plot.
- Plot entire radius range
- If checked, the maximum radius will be the largest value from amongst the traced rays.