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Measuring method of diffraction efficiency for plane grating based on Fourier spectral technology.

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    This study introduces a novel Fourier spectral technology method to measure diffraction efficiency, overcoming limitations of traditional instruments. This new approach enhances accuracy and offers superior spectral resolution and luminous flux for grating measurements.

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    Area of Science:

    • Optics
    • Spectroscopy
    • Diffraction Gratings

    Background:

    • Traditional double monochromatic instruments for measuring diffraction efficiency face challenges with output spectrum bandwidth differences and spectral overlap.
    • These issues in conventional methods compromise the accuracy of diffraction efficiency testing for plane gratings.

    Purpose of the Study:

    • To present a new diffraction efficiency measurement method utilizing Fourier spectral technology.
    • To address the limitations of traditional instruments, including spectral bandwidth variations and overlapping spectra.
    • To analyze the impact of errors in cube corner movement on measurement accuracy.

    Main Methods:

    • Developed a mathematical model for diffraction efficiency based on Fourier spectral technology.
    • Verified the model using ray tracing and Fourier optics simulations.
    • Analyzed the influence of tilt error, lateral shift error, and maximal moving distance error of a moving cube corner on measurement accuracy.

    Main Results:

    • The proposed Fourier spectral technology method improves measurement accuracy compared to traditional double monochromator instruments.
    • The new method demonstrates advantages such as high luminous flux, high spectral resolution, and simultaneous multiwavelength measurement.
    • High wavenumber accuracy is also achieved with the novel approach.

    Conclusions:

    • The Fourier spectral technology-based method offers a more accurate and advantageous approach for measuring diffraction efficiency.
    • The detailed error analysis provides valuable theoretical references for designing advanced diffraction efficiency instruments.
    • This technique enhances overall performance, including spectral resolution and accuracy, for grating characterization.