Dynamic vibrating three dimensional colorful laser projections, usually projected onto mist or smoke, have become a common feature of rock and roll concerts and discotheques. They have also been occasionally used in theatre, notably by Josef Svoboda.


LASER (Light Amplification by Stimulated Emission of Radiation) is a device which produces an intense narrow beam of coherent light (3) . The color of the laser beam depends on the gas used. Helium lasers produce red light, while neon lasers produce a greenish/bluish light. Neon lasers are commonly used in public performances (4). The high energy content of the laser beam makes its use in a public place  a health hazard for both performers and audience, and consequently the use of lasers is subject to strict regulations in most countries.

Systems for laser projection consist of a laser beam generator with a series of mirrors, connected to a motor, which moves rapidly in accordance with commands received from a computerized control board. In addition mirrors are scattered around the production area . The laser beam hits the moving mirrors, which project the beam onto one of the mirrors in the production area. This mirror then aims the beam towards the stage. The next beam is projected (onto another mirror) which also aims its beam onto the stage. In this way the beams move around rapidly, producing various effects.  As the speed of the mirror is extremely quick it gives the appearance of  constant movement.

The control board regulates the movement of the beam so that shapes such as fanned pictures, signs, advertisements, and so on, are created. If the stage is filled with smoke, the lasers will be emphasized and the effect can be amazing.