laser ppt

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laser ppt

  1. 1. • Excimer lasers (the name is derived from the terms excited and dimers) use reactive gases such as chlorine and fluorine mixed with inert gases such as argon, krypton, or xenon. When electrically stimulated, a pseudomolecule or dimer is produced and when lased, produces light in the ultraviolet range. • Dye lasers use complex organic dyes like rhodamine 6G in liquid solution or suspension as lasing media. They are tunable over a broad range of wavelengths. • Semiconductor lasers, sometimes called diode lasers, are not solid-state lasers. These electronic devices are generally very small and use low power. They may be built into larger arrays, e.g., the writing source in some laser printers or compact disk players.
  2. 2. Lasers are also characterized by the duration of laser emission - continuous wave or pulsed laser.
  3. 3.  In medicine  to break up gallstones and kidney stones,  to weld broken tissue (e.g. detached retina)  to destroy cancerous and precancerous cells; at the same time, the heat seal off capillaries,  to remove plaque clogging human arteries.  Surgical treatment
  4. 4.  In industry  to drill tiny holes in hard materials,  for welding and machining,  for lining up equipment precisely, especially in inaccessible places.
  5. 5.  In everyday life  to be used as bar-code readers,  to be used in compact disc players,  to produce short pulses of light used in digital communications,  to produce holograms.
  6. 6.  Holography is the production of holograms by the use of laser.  A hologram is a 3D image recorded in a special photographic plate.  The image appears to float in space and to move when the viewer moves.
  7. 7. In a fraction of a second, your vision can go dark.
  8. 8. NON-BEAM HAZARDS Non-beam hazards refer to anything other than the laser itself that can create a hazard. This type of hazard includes:  Electrical Hazards  Fire Hazards  Laser Generated Air Contaminants (LGAC)  Compressed Gases  Noise
  9. 9.  Class 2: “Laser Radiation – Do Not Stare into Beam.”  Class 2M: “Laser Radiation – Do not Stare into Beam or View Directly with Optical Instruments.”  Class 3R: “Laser Radiation – Avoid Direct Eye Exposure.”  Class 3B: “Laser Radiation – Avoid Direct Exposure to Beam”  Class 4: “Laser Radiation – Avoid Eye or Skin Exposure to Direct or Scattered Radiation.” Only Class 1 lasers require no labels. All other lasers must be labeled at the beam’s point of origin.
  10. 10. ” indicates a very dangerous situation that could result in serious injury or death. This sign should be used for Class 3R, 3B, and 4 lasers.  “ ” indicates a potentially hazardous situation which could cause a less serious injury. This sign should be used for Class 2 and 2M lasers.  “ does not indicate a hazardous situation. This sign should only be used to make people aware of facility policies regarding laser safety and/or to indicate that a service operation is in progress.
  11. 11. “CAUTION” Warning Sign CAUTION Laser Class and system Type of Laser, emitted wavelength, pulse duration, and maximum output Safety Instructions may include: • Eyewear Required • Invisible laser radiation • Knock Before Entering • Do Not EnterWhen Light is On • Restricted Area Safety Instructions
  12. 12. “DANGER” WARNING SIGN DANGER Laser Class and system Type of Laser, emitted wavelength, pulse duration, and maximum output Safety Instructions may include: • Eyewear Required • Invisible laser radiation • Knock Before Entering • Do Not Enter When Light is On • Restricted Area Safety Instructions
  13. 13. “NOTICE” Sign for Laser Repair NOTICE Safety Instructions (such as “Laser Repair in Progress”) Laser Class and system Type of Laser, emitted wavelength, pulse duration, and maximum output Safety Instructions may include: • Eyewear Required • Invisible laser radiation • Knock Before Entering • Do Not Enter When Light is On • Restricted Area
  14. 14. Control Measures  There are several measures that can be taken to prevent injury from lasers. These measures include:  Engineering Controls: Engineering controls are measures that are incorporated into the laser system and are designed to prevent injury to personnel  Administrative Controls: Administrative controls are procedures that are designed to prevent personnel from injury  Personnel Protective Equipment  Warning Signs and Labels
  15. 15. Personnel Protective Equipment  For skin : Ultraviolet lasers and laser welding/cutting operations may require that tightly woven fabrics be worn to protect arms and hands.  For eyes: Personnel Protective Equipment (PPE) for eyes exposed to Class 3B or 4 lasers is mandatory. Eyewear with side protection is best.

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