This suggests ejecting a secondary mirror in front of the craft to reflect light to brake the original craft: https://arxiv.org/pdf/1604.01356:
"...or by ejecting a reflector that is then used as a braking system (similar to thrust reversal on jets) but this only works if the payload is still within illumination range of the primary laser system"
"...or by ejecting a reflector that is then used as a braking system (similar to thrust reversal on jets) but this only works if the payload is still within illumination range of the primary laser system"