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| May 2010 |
| Billie Silvey |
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| 1. Laser technology—In laser technology, or Light Amplification by Stimulated Emission of Radiation, light is focused into a narrow wavelength. It is used in medicine (bloodless surgery), industry (cutting and welding) and defense (guidance, an alternative to radar). It is also used more popularly in laser pointers and light shows. |
| 2. Fiber Optics--Fiber optics uses pure glass strands as fine as a human hair, which can carry up to 10 million messages each over vast distances with less loss than wire. They can be bundled into coaxial cables and are used for computer networking, illuminating inside the body for surgery, analyzing composition, endoscopy and advertising signage. . |
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| LED--Light Emitting Diodes are energy efficient and long-lasting forms of lighting. My favorite bridge in Los Angeles, the Vincent Thomas Bridge across the main channel of the Los Angeles Harbor connecting San Pedro and Terminal Island, is illuminated by blue LEDs powered by solar panels. |
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| Sources of Light |
| For most of recorded history, from candles to gaslight, people have huddled by the fire for warmth, light and protection. Then, at the end of the 19th century, incandescent lighting began to be widely used. In recent times, the number of practical applications for light technology has burgeoned. Examples include the following: |