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  • What is Optical Density?
    Article - 6 Aug 2014
    Optical density is a term used in the field of optical spectroscopy for describing the propagation of a wave through a material.
  • Total Internal Reflection - Working Principle and Applications
    Article - 12 May 2014
    Total internal reflection is the reflection of the incident light that hits a medium boundary at an angle greater than the critical angle relative to the normal to the surface.
  • Photoelectric Effect - Definition and Applications
    Article - 6 May 2014
    Photoelectric effect is a result of emission of electrons when a matter is exposed to electromagnetic radiations such as photons of light.
  • What is a Pinhole Camera?
    Article - 24 Oct 2014
    A pinhole camera, also known as camera obscura or "dark chamber", is a simple camera that has a single small aperture called pinhole instead of a lens.
  • Moiré Pattern - Description and Applications
    Article - 15 May 2014
    Moiré patterns occur when materials are overlapped with repetitive lines. It is a naturally occurring interference pattern created by overlaying similar but slightly offset templates.
  • Michelson Interferometer - Definition and Applications
    Article - 6 May 2014
    Michelson interferometer is a tool to produce interference between two beams of light. It is the most common design for optical interferometry and was invented by Albert Abraham Michelson.
  • Phase-Contrast Microscope - Definition and Applications
    Article - 6 May 2014
    Phase-contrast microscope is a type of light microscopy that intensifies contrasts of transparent and colorless objects by influencing the optical path of light. Phase-contrast microscopy is an...
  • What is Optical Parametric Amplification (OPA)?
    Article - 6 May 2014
    Optical parametric amplification (OPA) may be described as a process of amplifying an input signal in the presence of a higher-frequency pump wave. Apart from signal amplification, an idler wave is...
  • 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.

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