I read in the Scientific American that a defense against lasers would be simply spinning the target, which would require the attack laser to have much more power. The target can be made shiny, and can be coated with an ablative material.
"Fülöp and colleagues argue that the energy problem could be overcome by splitting the laser pulse into two equal-energy pulses, which then hit the target simultaneously at different, precisely calculated angles of incidence (see figure). Through simulations, the team showed that when the laser pulses collide, a standing wave forms inside the solid target that increases the peak electric field. With the same pulse intensity used in previous experiments, their calculations suggest that the technique can double the energy of the proton beam and produce five times as many protons — all with far more flexible control parameters than required before.").
[0] https://physicsworld.com/a/laser-collisions-could-boost-prot...