| The basic idea is that on every wavefront exists a forward propagating spherical wavelet of light | This is now highly regulated in the U |
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| For details, see the article | Light is projected out towards multiple points |
Safety [ ] Some lasers have the potential to cause damage if aimed directly into the eye, or if someone were to stare directly into a stationary laser beam.
25| Diffraction [ ] A less complicated way of spreading the laser beam is by means of | Sometimes the beams are "bounced" to different positions with mirrors to create laser sculptures |
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| This enables the laser lighting designer to create patterns such as such as are often displayed on ; other methods of creating images through the use of galvanometer scanners and X-Y control voltages can generate letters, shapes, and even complicated and intricate images | 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 |
The initial wavefront manifests itself in the form of a straight line, as if the subject was seeing a wave coming in towards themselves in the water.
9| 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 | |
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| In the , the use of lasers in entertainment, like other laser products, is regulated by the FDA and additionally by some state regulatory agencies such as which requires licensure of some laser operators | Maximum Permissible Exposure MPE is the maximum amount of visible laser radiation considered not to cause harm, for a given exposure time |
Diffraction is the primary method that many simple laser projectors work.
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