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<p>In this investigation, a compact optical spectrometer with high resolution over a broad spectral range is proposed and experimentally verified. The proposed spectrometer employs a concave grating instead of a conventional planar grating, and multi-channel inputs allow a 2D CMOS camera to simultaneously acquire multiple spectra, each corresponding to a different spectral range. The full spectrum is reconstructed by combining these individual spectra, enabling the proposed system to achieve both high resolution and wide spectral range. In the feasibility experiment, four input channels were implemented, and the spectrum of a white LED (400–700&#xa0;nm) was measured with a resolution of 0.15&#xa0;nm, compared to approximately 0.25&#xa0;nm obtained using a commercial high-resolution spectrometer. The optical configuration can be further extended to cover ultraviolet and infrared spectral regions based on the same principle, and is expected to be widely applicable in various scientific and industrial fields.</p>

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Multi-Channeled Spectrometer Using a Concave Grating for High Resolution in the Wide Spectral Range

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Seoyoon Lee,
  • Jin Hee Cho,
  • Ki-Nam Joo

摘要

In this investigation, a compact optical spectrometer with high resolution over a broad spectral range is proposed and experimentally verified. The proposed spectrometer employs a concave grating instead of a conventional planar grating, and multi-channel inputs allow a 2D CMOS camera to simultaneously acquire multiple spectra, each corresponding to a different spectral range. The full spectrum is reconstructed by combining these individual spectra, enabling the proposed system to achieve both high resolution and wide spectral range. In the feasibility experiment, four input channels were implemented, and the spectrum of a white LED (400–700 nm) was measured with a resolution of 0.15 nm, compared to approximately 0.25 nm obtained using a commercial high-resolution spectrometer. The optical configuration can be further extended to cover ultraviolet and infrared spectral regions based on the same principle, and is expected to be widely applicable in various scientific and industrial fields.