The ABL uses a chemical reaction to generate a megawatt of infrared laser light. When a missile’s smoke trail from burning propellant sets off the 747’s sensors, a tracking laser locks onto the target’s most vulnerable spot, usually its fuel tank. Then the main laser fires away. It’s no simple feat: Robert McMurry, Jr., the ABL program director for the Missile Defense Agency, compares the challenge to “flying over the Washington Monument while shooting through a basketball hoop in Central Park.” If this summer’s demonstration is successful, further flight tests will help refine the technology for use in a second, more powerful and smaller prototype, expected in 2013. Read more of Popular Science’s predictions for 2009.
