Properties of laser light

Coherence

  • Laser light is highly coherent.
  • All emitted photons have constant phase relationship i.e they are in same phase.
  • The light from a laser is said to be coherent, which means the wavelengths of the laser light are in phase in space and time.

Coherence
Monochromaticity

  • monochromatic light means the light of only one wavelength (frequency).
  • There is no frequency difference between photons. So laser beam is monochromatic beam.
  • The light emitted from a laser is monochromatic, that is, it is of one wavelength.
  • In contrast, ordinary white light is a combination of many different wavelengths.

Directional

  • Lasers emit light that is highly directional.
  • Laser light is emitted as a relatively narrow beam in a specific direction.
  • Ordinary light, such as coming from the sun, a light bulb, or a candle, is emitted in many directions away from the source.

Unidirectionality

  • laser light is highly directional.
  • It can travel large distances without any spreading. Laser beam, is very narrow as compared to ordinary light.

Brightness

  • laser beam is extremely intense that light form any other sources when laser is focused at focused at a point.

Laser light

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