Answer : 2. "Romania"
Explanation :

Romania has developed the world's most powerful laser, part of the European Union's Infrastructure ELI project. The laser, called the “Extreme Light Infrastructure-Nuclear Physics” – (ELI-NP) laser, is located in Magurele, Romania, near Bucharest. It uses chirped-pulse amplification, a groundbreaking technology based on the inventions of Nobel Physics laureates Gerard Mourou and Donna Strickland. The laser is operated by French company Thales and is expected to have revolutionary applications in health care and space exploration.