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Results 161 - 170 of 366 for Photonics
  • Novel Creation of Double Diamond Colloidal Crystals
    Article - 21 Feb 2017
    A group of researchers from the University of Pennsylvania, US, have unexpectedly grown colloidal crystals with diamond symmetry, known as double diamond crystals (B32), using a DNA-mediated...
  • Defining the Response Time and Integration Time of Energy Sensors
    Article - 14 Sep 2015
    There is a lot of confusion surrounding the terms “integration time” and “response time” of energy sensors. This article will define these terms with respect to Ophir’s pyroelectric “Smart Sensors.”
  • Using the RM9 Radiometer System to Measure Very Low Power IR Lasers
    Article - 14 Sep 2015
    Laser beam powers are typically measured using thermal sensors and photodiode-based sensors. Thermal sensors are used for high laser power measurements.
  • Füchtbauer–Ladenburg Equation
    Article - 15 May 2014
    Füchtbauer–Ladenburg equation is used for calculating the stimulated emission cross-sections of the laser gain medium.
  • Gordon-Haus Jitter - Description and Principle
    Article - 15 May 2014
    The Gordon-Haus jitter is a timing jitter that originates from the fluctuations in center frequency. This jitter has been greatly influencing long haul fiber soliton systems by causing a jitter in the...
  • Brewster Window - Definition and Applications
    Article - 15 May 2014
    A Brewster window is an uncoated substrate that is positioned at Brewster’s angle within a laser, instead of external mirrors. This substrate acts as a polarizer such that the p-polarized light enters...
  • Bragg Mirrors - Definition and Applications
    Article - 15 May 2014
    A Bragg mirror, also known as a dielectric mirror, is a kind of mirror made up of alternating thin optical layers of two different materials. A quarter-wave mirror is the most commonly used Bragg...
  • B-Integral - Definition and Significance
    Article - 15 May 2014
    B-Integral is defined as the measure of the non-linear phase shift of light in devices like amplifiers. B-Integral is a term that is specific to non-linear optics. The non-linear shift of the laser...
  • Beam Combining - Definition and Applications
    Article - 19 Jun 2014
    Beam combining is done through a number of processes in order to scale up the power and radiance of laser sources. There are a number of techniques that allow the built up of high power laser sources...
  • Population Inversion - Definition and References
    Article - 29 May 2014
    Population inversion is a condition of the laser medium where a system consisting of a group of molecules or atoms exists in a higher excited state with more quantum systems than that of the lower...

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