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Related Concept Videos

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...
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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...
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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,...
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

Published on: October 23, 2018

Extreme supercontinuum generation to the deep UV.

S P Stark1, J C Travers, P St J Russell

  • 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1, 91058 Erlangen, Germany.

Optics Letters
|March 2, 2012
PubMed
Summary
This summary is machine-generated.

Researchers generated an ultrabroad supercontinuum down to 280 nm in the deep ultraviolet (UV) using tapered photonic crystal fibers. Two-photon absorption in silica ultimately limited deep-UV radiation generation.

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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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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

Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Materials Science

Background:

  • Supercontinuum generation is crucial for various applications, including spectroscopy and optical coherence tomography.
  • Photonic crystal fibers (PCFs) offer unique dispersion properties for controlling light-matter interactions.
  • Achieving deep-ultraviolet (UV) supercontinuum generation is challenging due to material limitations and nonlinear effects.

Purpose of the Study:

  • To investigate the generation of ultrabroad supercontinuum extending into the deep UV region.
  • To explore the role of tapered solid-core PCFs in enhancing deep-UV supercontinuum.
  • To identify the limiting factors in deep-UV supercontinuum generation.

Main Methods:

  • Utilizing sharply tapered solid-core photonic crystal fibers (PCFs) with taper lengths ranging from 5 to 30 mm.
  • Pumping the PCFs with femtosecond pulses (130 fs, 2 nJ) at a wavelength of 800 nm.
  • Analyzing the spectral characteristics of the generated supercontinuum, focusing on the deep-UV region.

Main Results:

  • Formation of an ultrabroad supercontinuum extending down to 280 nm in the deep UV.
  • Demonstration that tapering shifts the soliton fission point to a narrower core region, requiring normal dispersion at the fiber input.
  • Identification of strong two-photon absorption in silica as the primary limitation for deep-UV radiation generation.

Conclusions:

  • Tapered solid-core PCFs enable efficient deep-UV supercontinuum generation.
  • Soliton fission dynamics are critical for achieving extended spectral ranges in PCFs.
  • Two-photon absorption in the fiber material poses a significant challenge for further extending supercontinuum generation into the deeper UV spectrum.