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Source

The source optic is a special type of optic used at the start of Propagation systems. It cannot be inserted or deleted.

Sources have no further user-settable properties.

The initial mode for Propagation systems can be set in the System group of the Property Manager. The mode can be characterised in two ways:

• The mode size w and wave front radius of curvature R at the Source optic.
• The waist w₀ and its distance z₀ relative to the Source optic.

The parameters can be set independently for the sagittal and tangential planes.