If you've ever asked, "What is that blue light in the sky in Chandler?" you're not the first. But you might be among the last ...

A bright blue beam has been lighting up the metro Phoenix night sky, and a lot of Valley residents want to know why. In recent weeks, a glowing blue column rising roughly 3 miles into the air near ...

For the experiment, a high-power green laser was directed through ruby cube and illuminated with a blue laser from the side. The green laser increases the optical absorption of the blue illuminating ...

Can light itself cast a shadow? It may sound like a philosophical riddle, but researchers have found that under certain conditions, a laser beam can act like an opaque object and cast a shadow. The ...