Here is more about singlet oxygen, a fiercely powerful oxidiser: compared to this stuff, the usual diatomic oxygen is a pussy cat. It’s produced, among other ways, by the decomposition of hydrogen peroxide, which is why the high-test version of the stuff (as opposed to the 3% solution you get at the drug store) is so nasty.
Here are further details on the Boeing YAL-1 Airborne Laser, which used an oxygen-iodine laser to produce a megawatt beam to shoot down tactical ballistic missiles while in the boost phase.