The dependence of resonator length on the threshold power and emission wavelength of electron-beam-pumped UV-A edge-type emitting lasers is demonstrated. The lowest pump power thresholds are achieved ...

The US Air Force used B-2 Spirit stealth bombers and "bunker-busters" in strikes on Iran's nuclear sites. But what are they?

The weapon’s 6.25m length and precision targeting system guided by a Global Positioning System (GPS) enable accurate strikes against specific underground facilities.