| Air laser sniff bombs at a distance |
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 Are there any hidden bombs in the vicinity? Let the fresh air create a laser pulse and allows analysis at a distance. The new air laser has been developed by engineers at Princeton University in New Jersey, U.S. - We can send out a laser pulse and get a different pulse back from the air. The returning beam interacts with molecules in the air and carry with their fingerprints, "said Professor Richard Miles said in a statement. The second laser-based measurement technique to get back a reflection or diffusion of the laser pulse is sent out. But here, this is according to the researchers on an entirely newly-ray. Here's how: An ultraviolet laser pulse is focused onto a cylindrical area of the air, small as about one millimeter long cylinder. The energy excites electrons in the oxygen atoms present in the cylinder. When the laser pulse is turned off the oxygen electrons fall back and sends out an infrared light. Some light may be more electrons in the cylinder to fall, allowing the light to be strengthened. This will create a laser beam pointed right back at the original laser source. According to scientists, the new beam is several thousand times stronger than the beams to get back with conventional laser techniques. They expect to approach with great care to identify the contaminants in the air, in what quantities it is and where they are. Viewable by soldiers looking for mines as well as scientists who measure the pollutants. So far, researchers have demonstrated that the method works in the lab of a button half feet away. Increasing the distance will be easy; however, it is just to focus the beam away. The new method is described in an article in Science. |
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