  The essay gives an overview on researches in the field of laser ion
acceleration, focusing on two types of targets. There are many types of targets
while they can all be divided into targets that apply single ion or multiple
ions. Mixed solid targets are proven efficient in accelerating heavy ions and
generate high-quality ion beams with energy divergence lower than 5%.
Traditional methods like TNSA are mainly used to accelerate protons or heavy
ions and there are still many spaces for modification and improvement.
Applications of laser-driven ion beams are wide in fields like detector
technology, cancer therapy and so on, which is promising and necessary.
