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  • Sagnac Interferometer - Definition and Applications
    Article - 12 Feb 2014
    The Sagnac interferometer uses counter-propagating beams in a ring path. This is realized by either using multiple mirrors or with an optical fiber. Generally, three or more mirrors are used, so that...
  • Radiometer - Definitions and Applications
    Article - 30 Apr 2014
    A radiometer is an instrument for detecting and measuring radiant flux/power of electromagnetic radiation. The term radiometer usually refers to an infrared radiation detector; however, it also refers...
  • Diopter (unit) - Definition and Applications
    Article - 6 May 2014
    Diopter is the unit of measurement of the optical power of lens or a curved mirror. In terms of numerical value, it is equal to the reciprocal of the focal length of a lens of curved mirror measured...
  • NASA's Kepler Space Telescope to Begin New Missions?
    Article - 16 Aug 2013
    Since its launch in 2009, the $600m Kepler Telescope has successfully accomplished its initial objectives of identifying new potentially habitable planets far away from Earth. But now after a couple...
  • What is Optical Parametric Amplification (OPA)?
    Article - 6 May 2014
    Optical parametric amplification (OPA) may be described as a process of amplifying an input signal in the presence of a higher-frequency pump wave. Apart from signal amplification, an idler wave is...
  • Multi-Photon Absorption - Non-Linear Spectroscopy
    Article - 15 Aug 2013
    Multi-photon absorption is a technique that is widely used in atomic and molecular physics to determine the properties of materials.
  • What is Optical Phase Conjugation?
    Article - 6 May 2014
    Optical phase conjugation is a non-linear optical process, which is capable of time reversing the scattering process and healing the distortions in the wave front.
  • What is a Photomultiplier?
    Article - 8 Jul 2013
    Photomultipliers or photomultiplier tubes (PMTs) belong to a class of vacuum tubes that convert photons into electric signal. PMTs are known for their ultra-fast response and high sensitivity. They...
  • What is a Beam Dump?
    Article - 21 Jun 2013
    A beam dump maybe defined as a device used for absorbing the energy from photons or other particles.
  • Semiconductor Lasers: AlGaInP (Aluminum Gallium Indium Phosphide) Laser Properties and Applications
    Article - 10 Oct 2013
    The aluminium gallium indium phosphide laser is a type of visible-light diode laser. Visible diode lasers emit wavelengths of red and green in the visible spectrum of electromagnetic radiation.

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