  The FCAL collaboration is preparing large-scale prototypes of special
calorimeters to be used in the very forward region at future electron-positron
colliders. Two compact calorimeters are foreseen, LumiCal and BeamCal, designed
as sandwich calorimeters with very thin sensor planes to keep the Moli\`ere
radius small. Silicon sensor prototypes and dedicated FE ASICs have been
developed and produced for LumiCal. The ASICs have been designed to cope with
the timing and dynamic range requirements. The electromagnetic calorimeters of
the LUXE experiment are based on a similar technology to that developed by the
FCAL collaboration. LUXE will measure the number of positrons and their energy
spectrum in e-laser and $\gamma$-laser interactions or electrons in
$\gamma$-laser interactions. Results of recent beam tests will be presented.

High Energy Physics - Experiment;Instrumentation and Detectors