Laser Awareness 激光意识.pptVIP

Laser Awareness (Non-User) * What is a laser? Laser is an acronym for Light Amplification by Stimulated Emission of Radiation. * Why are Laser beams so much of a concern? A Laser amplifies light and produces coherent light beams, ranging from infrared to ultraviolet. Laser light can be made extremely intense, highly directional, and very pure in color. A one watt laser beam when focused down to a small spot can produce temperatures higher than the surface temperature of the sun! Additionally, the beam emitted by ultraviolet and infrared lasers can not be seen by the naked eye and are therefore require more stringent controls. * Is laser light harmful? The degree to which exposure to laser beams are harmful is dependent upon several things: Type of laser Strength of the laser If personal protective devices are used Is the laser being operated in accordance with approved instructions Are the laser safety interlocks functional All of these factors and others combined will determine the degree of danger associated with a certain type of laser radiation. * What is the difference between laser radiation and radiation from radioactive material? Laser radiation is non-ionizing, which means that it does not damage the cells of the body by ionization or excitation of individual atoms as does ionizing radiation (gamma x-rays) given off by radioactive material. Radiation from a laser and radioactive material are both part of the electromagnetic spectrum. * What part of the human body is most sensitive? Although the skin can be affected by exposure to laser radiation, the part of the human body that is most sensitive to light and can most easily be damaged by lasers is the human eye.? Common sense precautions such as not shining a laser into your own, or anyone elses eyes, will help prevent vision loss from laser exposure. * Will I be exposed to laser radiation? The use of lasers is only allowed in restricted, carefully controlled areas at Texas State University. Ev