Word: rodding
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...colorless and transparent. But a pinch of chromium added to the bath as an impurity gives the resulting crystals their characteristic ruby-red hue and supplies the chromium atoms (one for every 5,000 aluminum atoms) that cause the laser action. Excited Atoms. Both ends of the crystal rod are highly polished and silvered to act as mirrors, one highly reflective, the other partially transparent. Wrapped around the rod in the form of a coil is a flash tube similar to the strobe lights used by photographers...
When a pulse of electricity is fired through the tube, it gives off a brief, intense flash of light. Inside the ruby rod, the chromium atoms are highly excited by the light flash; their electrons temporarily absorb excess energy. Then, as the electrons fall back toward their normal energy levels, each emits a photon. Some of the photons pass through the transparent walls of the ruby rod and are lost. But many hit the mirrors at either end of the rod and are reflected back to the opposite mirror. As they bounce back and forth along the rod, they stimulate...
American Pinpoints. Unlike ordinary "white" light from an incandescent bulb, which is a mixture of all colors, and thus of many different wave lengths traveling in divergent directions, laser light is what scientists call "coherent." It emerges from the rod in rays that are parallel; it is all of the same wave length, and it is all in phase or in step, each ray reinforcing the others, like oarsmen in a superbly trained crew...
DRIVING BACK to the hotel after the gig Rod Stewart is hoarse and happy. "You have to jump around like I do to get the kids jumping too. Look at the other group they just stood there. They were playing too complicated, too static, very difficult to get that off the ground." He turned to Waller "I really like it when you tap on the snare and do the tom-tom at the same time. Its really deep you know what I mean." Again the bewitching London accent...
...fear however that no record can capture their sensual hammering music. At the end of their performance, Rod Stewart said "We're sorry to leave, but we'll come back to play here in September." Forget it fellas. Next time the Jeff Beck Group comes to this country they'll be playing in Los Angeles in a stadium that seats...