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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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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.
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    New 3D printed gradient-index (GRIN) optics can simultaneously focus light and split it into different colors. Multi-material GRIN designs, particularly with four materials, show promising results for advanced optical functions.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Additive Manufacturing

    Background:

    • Gradient-index (GRIN) optics offer unique light manipulation capabilities.
    • Traditional GRIN optics manufacturing has limitations in material blending.
    • 3D printing enables novel approaches to GRIN optic fabrication.

    Purpose of the Study:

    • To present a method for spectral splitting using multi-material GRIN optics manufactured via 3D printing.
    • To investigate the feasibility of simultaneous focusing and spectral splitting.
    • To explore the performance of GRIN designs with varying numbers of materials.

    Main Methods:

    • Utilized 3D printing for additive manufacturing of multi-material GRIN optical elements.
    • Designed GRIN optics with planar entrance and exit surfaces.
    • Conducted comparative design studies using two, three, and four-material GRIN configurations.

    Main Results:

    • Demonstrated spectral splitting capability in multi-material GRIN optics.
    • Showed that simultaneous focusing and spectral splitting is not achievable with two-material GRIN.
    • A four-material GRIN design exhibited optimized performance for combined optical functions.

    Conclusions:

    • Multi-material GRIN optics manufactured by 3D printing can achieve simultaneous focusing and spectral splitting.
    • Increasing the number of materials in GRIN designs enhances their functionality.
    • Optimized four-material GRIN designs hold significant potential for advanced optical applications.