What is the most powerful laser you have ever used or seen?

Question: What is the most powerful laser you have ever used or seen?
- Keywords:
  laser,
  physics
Asked by TSM_PJ to Mossy, Sonia on 14 Nov 2018. This question was also asked by 648nenp47, 443nenp52, 496nenp52.
- Sonia Lenehan answered on 14 Nov 2018:
  
  I don’t get to use lasers sadly! That would be cool though!

Question: What is the most powerful laser you have ever used or seen?