Terminology
The term excimer is short for 'excited dimer', while exciplex is short for 'excited complex.' Most "excimer" lasers are of the noble gas halide type, for which the term excimer is strictly speaking a misnomer (since a dimer refers to a molecule of two identical or similar parts): The correct but less commonly used name for such is exciplex laser.
Read more about this topic: Excimer Lasers