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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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...
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Quasi-light Storage for Optical Data Packets
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The optical frequency comb fibre spectrometer.

Nicola Coluccelli1,2, Marco Cassinerio1,2, Brandon Redding3

  • 1Dipartimento di Fisica-Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.

Nature Communications
|October 4, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces an all-fibre spectrometer combined with a frequency comb source for high-resolution, broadband optical detection. The system enables simultaneous measurement of thousands of comb lines, paving the way for advanced spectroscopic applications.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Area of Science:

  • Photonics and Spectroscopy
  • Optical Engineering
  • Laser Physics

Background:

  • Optical frequency combs offer precise, broadband light sources essential for high-speed detection.
  • A key challenge is achieving single comb-line resolution across a wide spectral band.
  • Existing methods often struggle with parallelizing detection over broad bandwidths.

Purpose of the Study:

  • To develop a novel all-fibre spectrometer system leveraging frequency comb technology.
  • To enable simultaneous, high-resolution detection of numerous optical comb lines.
  • To demonstrate the system's capability for precision spectroscopic measurements.

Main Methods:

  • Integration of a frequency comb source with a fibre spectrometer.
  • Utilization of all-fibre technology for system construction.
  • Simultaneous and sequential acquisition strategies for comb line measurement.

Main Results:

  • Simultaneous measurement of 500 isolated comb lines over a 0.12 THz span in a single acquisition.
  • Demonstration of measuring 3,500 comb lines over 0.85 THz via sequential acquisitions.
  • Successful precision spectroscopy of acetylene at 1.53 μm.

Conclusions:

  • The proposed all-fibre system offers a low-cost, lightweight solution for broadband, high-resolution spectroscopy.
  • This technology has the potential to enable a new generation of advanced spectrometers.
  • The system effectively addresses the challenge of parallelizing detection across wide optical bands with high resolution.