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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...
  • What is Optical Resolution?
    Article - 30 Oct 2014
    Optical resolution is the physical resolution at which an imaging device can capture an image.
  • The Advantages and Applications of the Mach-Zehnder Interferometer
    Article - 1 Aug 2014
    The Mach–Zehnder interferometer is a simple highly configurable device used for demonstrating interference by division of amplitude.
  • Depth of Focus - Introduction and Meaning
    Article - 6 May 2014
    Depth of focus in optics is a measure of the tolerance of placement of the image plane with respect to the lens. In photography, depth of focus refers to the tolerance of the films displacement within...
  • The History of the Catoptric Optical System
    Article - 6 Aug 2014
    Catoptrics has been introduced way back in time by the ancient Greeks. There were two main ancient Greek texts that mentioned catoptrics.Catoptric systems are those optical systems that employ only...
  • Coma – Definition and Causes of Comatic Optical Aberration
    Article - 12 Feb 2014
    Optical aberrations are deviations from geometric optics that are mainly caused by faults in optical lenses.
  • What is an Optical Longpass Filter?
    Article - 25 Apr 2014
    An optical longpass filter is defined as an optical filter that passes all wavelengths from a given wavelength to the red of that wavelength.
  • What is an Optical Bandpass Filter?
    Article - 24 Jul 2013
    Optical bandpass filters are filters that allow only a certain bandwidth of light and block the others above and below the specified bandwidth.
  • What is an Absorptive Filter?
    Article - 25 Apr 2014
    Absorptive filters are essentially glass filters that are dyed or pigmented gelatin resins. Like any other filter, absorptive filters allow light of certain wavelengths to pass through. These are...
  • Factors to Consider When Selecting a Stereo Microscope
    Article - 24 May 2012
    Choosing a stereo microscope? Assess application, user needs, magnification, optics, ergonomics, and lighting.

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