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  • Using Calibrated Photodiodes to Measure LED Power and Irradiance
    Article - 15 Sep 2015
    Many industries have started using LEDs as a replacement for conventional broadband light sources, including deuterium, xenon, mercury, and quartz-halogen lamps
  • Pound-Drever Hall Technique for Laser Frequency Stabilization
    Article - 12 May 2014
    The Pound-Drever Hall (PDH) method is a known and sophisticated method for frequency stabilization of lasers, for instance diode lasers, to a reference optical cavity, for instance Fabry-Perot cavity,...
  • Hermite-Gaussian Modes - Explanation and Equation
    Article - 15 May 2014
    Propagation of light in a free space or a homogenous optical medium changes the intensity profile of light. In certain electric field amplitude distributions, the shape of the amplitude profile...
  • Chromatic Dispersion - Definition and Applications
    Article - 15 May 2014
    Chromatic dispersion is the change in refractive index due to change in wavelength. Dispersion is the phenomenon that causes light to be separated into various colors while passing through a prism....
  • Wavefront - Introduction and References
    Article - 29 May 2014
    A wavefront may be described as a surface over which an optical wave presents a constant phase. In other words, a wave front may be the surface over which a wave represents a crest (maximum point) or...
  • Radiant Flux - Explanation and References
    Article - 29 May 2014
    Radiant flux is the energy per unit time that is radiated from an optical source, expressed in terms of Watts.
  • Quantum Efficiency - Introduction and References
    Article - 29 May 2014
    Quantum efficiency (QE) may be defined as the fraction of incident photons that are recorded by a photo detector. The quantum efficiency of a photosensitive device is measured in terms of electrons...
  • Laser Mode Locking - Theory and Applications
    Article - 29 May 2014
    Mode locking is a technique used to obtain ultra short pulses from lasers. Lasers that are mode locked are capable of producing pulses having pulse widths in the order of sub-pico seconds or even...
  • What is a Lambertian Surface?
    Article - 8 Oct 2014
    A Lambertian surface for reflection is a surface that appears uniformly bright from all directions of view and reflects the entire incident light. Lambertian reflectance is the property exhibited by...
  • Aiming Beam and Coaxial Laser Beam
    Article - 19 Sep 2014
    An aiming beam is a laser beam (or any other light source) which is used as a light for guiding.

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