  Extreme-ultraviolet (XUV) light is notoriously difficult to control due to
its strong interaction cross-section with media. We demonstrate a method to
overcome this problem by using Opto-Optical Modulation guided by a geometrical
model to shape XUV light. A bell-shaped infrared light pulse is shown to
imprint a trace of its intensity profile onto the XUV light in the far-field,
such that a change in the intensity profile of the infrared pulse leads to a
change in the shape of the far-field XUV light. The geometrical model assists
the user in predicting the effect of a specific intensity profile of the
infrared pulse, thus enabling a deterministic process.
