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  • Speckle Pattern - Introduction and Applications
    Article - 15 May 2014
    Speckle pattern is a random granular pattern produced by the reflection of coherent light beam e.g. laser, at a rough surface such as a metallic surface, a display screen, white paint or a piece of...
  • Refractometer - Definition and Applications
    Article - 6 May 2014
    A refractometer is an optical device used for measuring the extent to which light is bent or refracted when it moves through a substance.
  • What are Photons?
    Article - 15 Sep 2014
    The term photon was coined by Gilbert Lewis in 1926. A photon is a type of elementary particle that forms the basic unit of electromagnetic radiation, which includes infrared, ultraviolet, visible...
  • Fizeau Interferometer - Definition and Applications
    Article - 1 May 2014
    Interferometric measurements can be carried out in an optical arrangement in which two or more beams originated from the same source, but passing in different paths are made to interfere....
  • Astigmatism in Optical Systems
    Article - 1 May 2014
    An optical system that is plagued with astigmatism focuses two orthogonal axes of light at two different distances.
  • What is Raman Amplification?
    Article - 11 Jul 2013
    Raman amplification is a phenomenon in non-linear optical mediums where the transfer of power from one optical beam to another happens when it is downshifted in frequency by the energy from an optical...
  • Properties and Applications of Argon Lamps
    Article - 3 May 2014
    Argon lamps are gas discharge lamps that contain argon gas at a low pressure enveloped in a glass capsule. Gas discharge lamps emit light when electric light is passed through the gas. Argon lamps...
  • What is a Nernst Lamp?
    Article - 18 Jun 2013
    Nernst lamps are thermal light sources that emit radiation near the infra red region of the electromagnetic spectrum.
  • What is a CCD Sensor?
    Article - 23 Oct 2014
    The CCD (charge coupled device) was first invented at the Bell laboratories in the 1960s. CCDs are thin wafers which consist of a number of buried electrodes that facilitate the movement of electrons...
  • Cerium LiSAF and Cerium LiCAF Lasers – Properties and Applications
    Article - 25 Apr 2014
    Cerium is the simplest rare earth metal known. The Ce:LiSAF and Ce:LiCAF lasers are categorised as UV diode lasers.

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