Laser lighting display

From Wikipedia, the free encyclopedia

Copper Bromide laser in operation. Seen in South Florida in February 2006.

A laser lighting display or laser light show involves the use of laser light to entertain an audience. A laser light show may consist only of projected laser beams set to music, or may accompany another form of entertainment, typically a rock concert or other musical performance.

Laser light is useful in entertainment because the coherent nature of laser light causes a narrow beam to be produced, which allows the use of optical scanning to draw patterns or images on walls, ceilings or other surfaces including theatrical smoke or fog. Laser scanners consist of small mirrors which are mounted on galvanometers to which a control voltage is applied. The beam is reflected a certain amount which correlates to the amount of voltage applied to the galvanometer scanner. Two galvanometer scanners can enable X-Y control voltages to aim the beam to any point on a square or rectangular raster. This enables the laser lighting designer to create of patterns such as Lissajous figures (such as are often displayed on oscilloscopes); other methods of creating images through the use of galvanometer scanners and X-Y control voltages can generate letters, shapes, or even images. (The use of X-Y raster scanning to create images is also used in television picture tubes.) A planar or conical moving beam aimed at smoke or fog can display a plane or cone of light known as a "laser tunnel" effect.

1 Safety
2 Origin
3 See also
4 External links

[edit] Safety

Lasers can cause eye damage if aimed directly into the eye, or if someone were to stare directly into a stationary laser beam. Some high-power lasers used in entertainment applications can also cause burns or skin damage if a sufficient amount of energy (typically a stationary beam) is directed onto the human body. In the US, the use of lasers in entertainment, like other laser products, is regulated by the Food and Drug Administration (FDA) and additionally by some state regulatory agencies such as New York State which requires licensure of some laser operators. Safety precautions used by laser lighting professionals include beamstops and procedures so that the beam is projected above the heads of the audience. It is possible, and in some countries commonplace, to do deliberate audience scanning. In such a case, the show is supposed to be designed and analyzed to keep the beam moving, so that no harmful amount of laser energy is ever received by any individual audience member.

Lasers used outdoors can pose a risk to pilots of aircraft if too-bright light enters the cockpit. In the U.S., outdoor laser use is jointly regulated by the FDA and the Federal Aviation Administration. For details, see the article Lasers and aviation safety.

[edit] Origin

The idea of using light to accompany music goes at least as far back as 1730, when Castel came up with an early color organ. However, laser light shows fully emerged in the early 1970s and became a form of psychedelic entertainment, usually accompanied with a live musical performance on stage or pre-recorded music at a Laserium. Blue Öyster Cult, on their 1976 Agents of Fortune tour, was one of the first high profile bands to use a laser in their concert shows. They infamously pointed the laser directly into the crowd in shows, creating controversy over the potential for harm. This practice is now highly regulated in the U.S., to the point where almost all U.S. shows do not have laser beams go into or close to the audience.

[edit] See also

[edit] External links

v • d • e Display Technology
Non-video	Split-flap display \| Flip-dot display \| Electronic paper
Video	Vacuum fluorescent display \| Cathode ray tube \| Plasma display (Organic) Light-emitting diode \| Laser TV \| Liquid crystal display Digital light processing \| Liquid crystal on silicon Surface-conduction electron-emitter display \| Field emission display Incandescent light bulb
3D	Stereoscopic \| Volumetric \| Laser beam
Static media	Movie projector \| Slide projector \| Hologram \| Neon sign