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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...
Flame Photometry: Overview01:02

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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IR Spectrometers

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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Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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...
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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Channeled spectropolarimetry using a coherent white-light continuum.

Toshihiro Somekawa1, Kazuhiko Oka, Masayuki Fujita

  • 1Institute for Laser Technology, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan. somekawat@ile.osaka-u.ac.jp

Optics Letters
|November 18, 2010
PubMed
Summary
This summary is machine-generated.

This study demonstrates a new spectropolarimetry technique using a broadband white-light continuum for precise polarization measurements. The method successfully analyzes highly attenuating samples, advancing optical characterization capabilities.

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Published on: October 11, 2016

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Spectroscopy

Background:

  • Channeled spectropolarimetry is a powerful technique for analyzing the polarization properties of light.
  • Generating a broadband light source is crucial for comprehensive spectral analysis.
  • Previous methods faced limitations in dynamic range and spectral coverage.

Purpose of the Study:

  • To develop and demonstrate a novel spectropolarimetric approach using a coherent white-light continuum.
  • To reconstruct the complete set of Stokes parameters across a wide spectral range.
  • To validate the technique's effectiveness with highly attenuating samples.

Main Methods:

  • Generation of a coherent white-light continuum in Krypton gas using a terawatt femtosecond laser.
  • Implementation of channeled spectropolarimetry with the generated broadband light source.
  • Measurement and reconstruction of Stokes parameters from 450-700 nm from a single spectral acquisition.

Main Results:

  • Successful reconstruction of complete Stokes parameters (450-700 nm) from one measurement.
  • Experimental validation of channeled spectropolarimetry with a sample exhibiting transmittance as low as 10^-6.
  • Demonstration of the technique's capability for analyzing samples with extreme optical densities.

Conclusions:

  • Coherent white-light continuum is an effective broadband source for spectropolarimetry.
  • The demonstrated technique offers high sensitivity and broad spectral coverage.
  • This advancement enables detailed polarization analysis of challenging, highly attenuating materials.