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UV–Vis Spectrometers01:14

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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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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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A double monochromator for the extreme ultraviolet.

R W Carlson

    Applied Optics
    |January 15, 2010
    PubMed
    Summary

    This study presents an extreme ultraviolet double monochromator using rotating diffraction gratings for wavelength selection. The design achieves fourth-order focusing accuracy, comparable to the Seya mounting, for enhanced spectral analysis.

    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Ultraviolet Technology

    Background:

    • Traditional monochromator designs face limitations in extreme ultraviolet (EUV) spectral analysis.
    • Developing efficient and accurate EUV optical systems is crucial for various scientific applications.

    Purpose of the Study:

    • To present an optimized optical design for a double monochromator specifically for the extreme ultraviolet (EUV) range.
    • To achieve accurate wavelength scanning with fixed slits using rotating diffraction gratings.

    Main Methods:

    • The design utilizes two concave diffraction gratings that rotate to select wavelengths.
    • Fixed entrance and exit slits are employed for system simplicity.
    • Optical parameters and symmetry were adjusted to achieve fourth-order focusing accuracy.

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    Main Results:

    • The double monochromator design achieves approximate focusing accurate to the fourth order of grating rotation.
    • The defocusing at the exit slit is comparable to established Seya mountings.
    • Astigmatism was calculated, and transmission properties were analyzed.

    Conclusions:

    • The presented double monochromator design offers a viable solution for EUV spectroscopy.
    • The system provides a good balance of focusing accuracy and design simplicity for EUV applications.