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Lasers that stimulate condensation may help to induce rain artificially. Zeeya Merali The rain dance is getting a twenty-first-century revamp using laser technology. Optical physicists have demonstrated that shooting lasers into the air can trigger the formation of water droplets, a technique that could one day help to stimulate rainfall. For more than 50 years, efforts to try to [...] LOBO electronic recently premiered its first interactive laser show at Germany’s Holiday Park. LOBO’s Alex Hennig said the show worked better than expected, with thousands of audience members eagerly responding to the commands of a laser-projected girl. The show, performed this summer in the theme park’s Aqua Stadium, [...] SCIENTISTS are using the world’s largest laser in an attempt to build a star on Earth.
The laser at the Lawrence Livermore National Laboratory is roughly the size of three American football fields, and those in charge of it aren’t joking when they say they’ll create a tiny sun in the next few months. It’s called the National Ignition Facility and it’s all about finding the holy grail of energy production – nuclear fusion – a high-energy reaction that would theoretically provide limitless energy for humanity. In a nutshell, the laboratory hopes to split its laser beam up into 192 beams, then fire them at a tiny target wrapped in gold that’s smaller than a fingernail. Continue reading World’s largest laser fires up for attempt to build new star on Earth Patricia Daukantas For almost as long as visible-wavelength lasers have existed, artists have been inspired by their potential to create stunning visual displays.As the clock ticked toward the end of the first half of Super Bowl XLIV, two teams huddled on the sidelines, waiting for the signal. Each had a single objective and a tight timeframe for achieving their goal.
But they weren’t looking to score a touchdown. Rather, these teams were the special-effects technicians for the halftime show. They had nine minutes to ensure that 16 powerful lasers were hooked up and safely aligned to a 40-section platform in preparation for a laser show to accompany the performance of the rock group the Who. More than 100 million people watched the Feb. 7, 2010, performance on television, making it one of the most-viewed laser shows ever. The special effects teams set up two “laser compounds,” one at each 35-yard line on the New Orleans Saints’ side of the gridiron. Each compound had two 50-W Nd:YAG pulsed lasers, cooled with a recirculating-water chiller, plus two air-cooled, full-spectrum units: a 25-W optically pumped semiconductor (OPS) laser and a 13-W diode-pumped solid-state (DPSS) RGB laser. Laser shows have always held a universal appeal. People from all over the world have enjoyed them at planetariums, concerts, corporate meetings and other venues. In the United States, outdoor laser displays dance across the faces of the Grand Coulee Dam in Washington and Stone Mountain in Georgia. They illuminate the pyramids of Giza in Egypt and the night sky above the Hong Kong business district. Coherent beams of color formed pictures of Olympic athletes against the side of the Sydney Opera House in 2000, and, at the 2010 Olympic Winter Games in Vancouver, 20 lasers were used in a nightly light show in which people from around the world controlled the beams through public Internet access. How laser shows workThe stunning visual effects of laser shows rely on some of the simplest optical equipment and principles: moving mirrors and the effect known as persistence of vision—which refers to the afterimage that persists when a point of light moves faster than the eye can react to it. The afterimage lasts for roughly 1/25 of a second. A European project unveils a fully CMOS-compatible laser source coupled to a silicon waveguide. A team of researchers from across Europe will present details of a fully CMOS-compatible laser source that is coupled to a silicon waveguide this week. The achievement is a major milestone in a three-year €3.2m project known as WADIMOS (Wavelength Division Multiplexed Photonic Layer on CMOS). The ultimate goal of the project is to demonstrate a photonic interconnect layer on CMOS. WADIMOS, an EU-funded research project, started in January 2008 and has six project partners. It is co-ordinated by IMEC of Belgium and also involves STMicroelectronics, MAPPER Lithography, Lyon Institute of Nanotechnologies (INL) and the University of Trento. Working with a circuit design from INL and IMEC, LETI completed the specific process studies for the laser source by adapting and modifying standard III-V materials process steps to comply with a CMOS environment. Specifically, LETI replaced gold-based metal contacts with a Ti/TiN/AlCu metal stack. The circuits were processed on 200 mm wafers at LETI’s facilities. Green Event at the Key Club – April 10, 2009 |
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