Related Experiment Video

Updated: Jun 22, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
09:39

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

Published on: May 27, 2013

Ultraviolet-induced paramagnetic centers and absorption changes in singlemode Ge-doped optical fibers

Kader Médjahdi, Aziz Boukenter, Youcef Ouerdane

    Optics Express
    |June 12, 2009
    PubMed

    More Related Videos

    Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light09:19

    Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

    Published on: July 29, 2013

    Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors08:32

    Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

    Published on: January 29, 2013

    Related Concept Videos

    UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

    UV–Vis Spectroscopy: Molecular Electronic Transitions

    In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
    Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

    Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

    Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
    UV–Vis Spectrometers01:14

    UV–Vis Spectrometers

    The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
    UV–Vis Spectroscopy of Conjugated Systems01:32

    UV–Vis Spectroscopy of Conjugated Systems

    Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
    One of the factors influencing λmax is the extent of conjugation in the...
    UV–Vis Spectrum01:30

    UV–Vis Spectrum

    When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
    The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
    IR Absorption Frequency: Delocalization01:04

    IR Absorption Frequency: Delocalization

    Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
    In IR spectroscopy,...