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  • What is Transparency?
    Article - 10 Feb 2014
    In optics, transparency, also referred to as pellucidity or diaphaneity, is the physical property of allowing light to pass via the material without being scattered.
  • What is Ultraviolet Light (UV)?
    Article - 7 Feb 2014
    Ultraviolet (UV) light is a portion of the electromagnetic spectrum between the visible rays and X-rays. It lies in the frequency range of 10 to 400 nm with photon energies from 3 to 124 eV.
  • Ulbricht Sphere - Definition and Applications
    Article - 6 Feb 2014
    Ulbricht sphere, also known as an integrating sphere, is an optical device used for measuring the reflectivity/transmittivity of optical components and optical flux from an LED or bulb and a laser...
  • Speckle Pattern - Introduction and Applications
    Article - 4 Feb 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...
  • Sagnac Interferometer - Definition and Applications
    Article - 4 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...
  • Gain Medium - Definition and Use in Laser Construction
    Article - 31 Jan 2014
    Gain medium is a quantum system that amplifies laser beams by means of stimulated emission.
  • Optical 3D Metrology in Industrial Opthalmic Applications
    Article - 27 Jan 2014
    With hundreds of millions of people choosing contacts for either visual or aesthetic reasons, and millions more having surgery to solve vision problems associated with aging, there is a growing need...
  • What is a Prism?
    Article - 20 Jan 2014
    A prism is a transparent geometric optical object with a minimum of two polished plane faces inclined relative to each other, from which light is reflected or through which light is refracted.
  • Pellin-Broca Prism - Definition and Uses
    Article - 16 Jan 2014
    A Pellin–Broca prism is a type of constant-deviation dispersive prism. It is named after its inventors, Ph. Pellin, a French instrument maker and André Broca, a professor of physiological optics.
  • Optical Coherence - Definition and Applications
    Article - 8 Jan 2014
    Optical coherence is associated with interference effects of light. A field of light is said to be coherent when the electric field values at different locations are in a fixed phase.

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