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Related Concept Videos

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)...

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Fundamental absorption edge in laser window CdTe.

A V Nurmikko

    Applied Optics
    |February 16, 2010
    PubMed
    Summary

    Fundamental absorption edge and infrared absorption were studied in Cadmium Telluride (CdTe) laser windows. Edge spectroscopy proves effective for assessing the overall optical quality of CdTe materials.

    Area of Science:

    • Materials Science
    • Optics
    • Solid State Physics

    Background:

    • Laser windows require high optical quality for efficient performance.
    • Understanding optical properties is crucial for material selection and fabrication.

    Purpose of the Study:

    • To investigate the fundamental absorption edge and infrared absorption in Cadmium Telluride (CdTe) laser window samples.
    • To evaluate the utility of edge spectroscopy as a diagnostic tool for optical quality assessment.

    Main Methods:

    • Spectroscopic analysis of the fundamental absorption edge.
    • Measurement of infrared absorption at 10.6-micrometer wavelengths.
    • Comparison of results across CdTe samples with varying optical quality.

    Main Results:

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    • Distinct correlations were observed between absorption edge characteristics and overall optical quality.
    • Infrared absorption at 10.6 micrometers provides complementary data.
    • Edge spectroscopy demonstrated sensitivity to subtle variations in material quality.

    Conclusions:

    • Fundamental absorption edge spectroscopy is a sensitive and effective method for evaluating the optical quality of CdTe laser windows.
    • This technique can guide material selection and processing for improved laser window performance.