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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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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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    A novel compact cross-grating spectrometer integrates Echelle spectrometer functions into one element. This advancement offers a compact, high-resolution spectral analysis tool for diverse scientific applications.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Nanofabrication

    Background:

    • Classical Echelle spectrometers offer high spectral resolution but are often bulky.
    • Integrating multiple optical functions into a single element is a key goal in spectrometer miniaturization.

    Purpose of the Study:

    • To present a novel compact cross-grating spectrometer concept.
    • To demonstrate the integration of Echelle spectrometer functionalities into a single optical element.
    • To evaluate the performance of the developed spectrometer.

    Main Methods:

    • Concept development and optical design of a concave cross-grating.
    • Fabrication of the grating using two-photon lithography.
    • Experimental testing and performance evaluation of the spectrometer.

    Main Results:

    • Successful integration of imaging and two-dimensional dispersion into a single optical element.
    • Achieved a spectral range of 400-1100 nm.
    • Demonstrated spectral resolution exceeding 10^2 (Δλ ∼ 6.2 nm @ 633.4 nm).

    Conclusions:

    • The compact cross-grating spectrometer represents a significant advancement over traditional Echelle designs.
    • The developed spectrometer offers high performance in a miniaturized form factor.
    • Two-photon lithography is a viable method for fabricating complex grating structures on curved surfaces.