What particles make up lasers?

Question: What particles make up lasers?
- Keywords:
  laser,
  particle
Asked by 395ghtg42 to Stephen, Dervil, Moises, Saoirse on 16 Nov 2016.
- Moises Jezzini answered on 16 Nov 2016:
  
  If you split matter to its minimum you will get an atom.
  If you split light, like a laser, to its minimum you will get a photon.
  
  So lasers are made of photons!

Question: What particles make up lasers?