  We propose and show that application of light leads to an intriguing platform
for controlling exceptional points in non-Hermitian topological systems. We
demonstrate our proposal using three different non-Hermitian systems -- nodal
line semimetals, semi-Dirac semimetals and Dirac semimetals -- and show that
using illumination with light one can engineer the positions and stability of
exceptional points. We illustrate the topological properties of these models
and map out their light-driven topological phase transitions.
