High-intensity military lasers suffer heat setback
DOI: 10.1063/PT.5.023512
 New Scientist 
In recent tests, several prototypes have suffered serious damage to their optics at intensities well below the expected levels of tolerance. “Optical damage has been quietly alarming upper management in most major programs,” Sean Ross of the US Air Force Research Laboratory in New Mexico told a meeting of the Directed Energy Professional Society in Newton, Massachusetts, last week. There are also big problems managing the waste heat generated by high-intensity beams.