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  • Neutral Density Filter - Definition and Properties
    Article - 18 Sep 2014
    A neutral density filter is a semi-transparent glass filter used in front of a camera lens to reduce or vary the intensity of incoming light without affecting the color rendition.
  • Gain Medium - Definition and Use in Laser Construction
    Article - 12 Feb 2014
    Gain medium is a quantum system that amplifies laser beams by means of stimulated emission.
  • Gaussian Beam - Definition and Parameters
    Article - 6 May 2014
    A Gaussian beam is a beam of electromagnetic radiation with intensity distributions and transverse electric field represented by Gaussian functions.
  • Birefringence - Definition and Applications
    Article - 1 May 2014
    Optical birefringence is an inherent property of a material that causes double refraction of a ray of light resulting in polarization of the light wave.
  • Applications of 3D Microscopy
    Article - 6 May 2014
    The technical field of microscopy deals with the use of different types of microscopes to view and study samples and objects that otherwise cannot be viewed with the naked eye.
  • 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 Four-Wave Mixing?
    Article - 1 Oct 2014
    Four-wave mixing (FWM) is a non-linear optical process where two other waves are produced by the interaction of two wavelengths. Four-wave mixing can take place in any kind of material.
  • What is a Collimator?
    Article - 10 Jun 2013
    A collimator may be described as a device that focuses or narrows a light beam or a stream of particles to be aligned in a different direction or reduce its cross section. The collimator focuses a...
  • What is a Periscope?
    Article - 11 Sep 2014
    A periscope can be defined as an optical instrument that allows the viewing of objects that are not in the direct life of vision. Periscopes prove to be of great help to submariners to have a view of...
  • Aluminum Gallium Arsenide Lasers – Properties and Applications
    Article - 25 Apr 2014
    The aluminium gallium arsenide laser is a diode laser, having similar characteristics as that of aluminium gallium indium phosphide laser. The structure of AlGaAs is the same as gallium arsenide, but...

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