Control

Inputs / Description

Defaults

X/Y Angle

X and Y divergence half-anlges in degrees.

1,1

Zx/Zy

Z position of x- and y- focii of astigmatic beam.

0,0

Zstart

Starting position of rays relative to Source location.

0

Zcreate

Distance relative to the source origin at which the wavefront is synthesized.

The z-create distance should generally correspond to the distance of the first optical element that the rays will encounter. FRED uses the Gaussian beam parameters to compute the wavefront curvature and size at the z-create distance and then moves the rays back to their origin prior to raytracing.

For incoherent sources, FRED modifies the path lengths and powers of the rays at the z-create distance.

0

Wavlen (um)

Wavelength used to compute Gaussian beam parameters.

1.0 microns