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Laser Eye Effects (1968) / Chapter Skim
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Devices for Eye Protection
Pages 83-86

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From page 83...
... A review of representative devices and their operating principles indicates two general classes of eye protective devices, i.e., dynamic devices that may or may not be activated, and static devices that reflect or filter a given wavelength more than others. Dynamic Devices This type of device is normally transparent to visible light and increases its optical density upon exposure to an intensive light source.
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From page 84...
... DISCUSSI0N 0F DEVICES Photoropic Reactions Theoretically, the photoropic spectral absorption mechanism is capable of nanosecond reaction time, and, consequently, a great deal of the research in countermeasures has been undertaken in this area. Some confusion has arisen in the use of various words, apparently interchangeably, to describe the phototropic reaction.
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From page 85...
... Although perhaps adequate for nuclear flash protection, their optical densities are too low and reaction times too slow for laser eye protection. Destroying 0ptical Path An evaporated thin film reflecting coating was used as one of the internal reflecting surfaces in an optical system.
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From page 86...
... Fixed Filter, i.e., Neutral Density, Absorbing and/or Reflecting Systems Several lightweight spectacle or goggle type protective devices have been developed which appear to offer excellent protection against pulsed laser sources at a relatively low cost and weight. These systems are partially transparent to the portion of the visible spectrum below the region of ruby lasers and enable the viewer to see while protecting against either or both ruby and neodymium lasers.
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Key Terms

  • eye protection
  • visible spectrum
  • eye protective
  • light source
  • optical path

  • spectral absorption
  • neutral density
  • protective device
  • closure times
  • develop eye

  • protective devices
  • density filter
  • laser irradiation
  • nuclear flash
  • change optical

  • partially transparent
  • fifty microseconds
  • intense light
  • fixed filter
  • visible light

  • wavelength optical
  • available methods
  • devices photoropic
  • dynamic devices
  • material property

  • ultraviolet spectra
  • internal reflecting
  • military security
  • narrow band
  • nanosecond reaction


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