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This study introduces a new imaging spectrometer design using InGaAs detectors, achieving a wide 400-1750 nm spectral range. The innovative design corrects chromatic aberration, enabling miniaturization and easier installation for visible and near-infrared spectroscopy.

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Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Detector Technology

Background:

  • Advancements in back-illuminated Indium Gallium Arsenide (InGaAs) detectors enable wider spectral ranges (400-1800 nm) with high quantum efficiency.
  • Traditional detectors (HgCdTe, CCD, CMOS) have limitations in spectral coverage and efficiency compared to emerging InGaAs technology.
  • Wider spectral ranges in imaging spectrometers introduce challenges like axial chromatic aberration, secondary spectrum, and optical axis alignment.

Purpose of the Study:

  • To design a wide spectral range (400-1750 nm) transmission prism-grating imaging spectrometer.
  • To address and correct axial chromatic aberration and secondary spectrum within the spectrometer.
  • To ensure system optical axis perpendicularity to the detector plane for simplified post-installation adjustment.

Main Methods:

  • Utilized Code V optical design software for system design and analysis.
  • Applied chromatic aberration correction theory by selecting appropriate optical glass materials.
  • Implemented a design process focusing on correcting axial chromatic aberration and secondary spectrum.

Main Results:

  • Achieved a spectral resolution of 5 nm over the 400-1750 nm range.
  • Demonstrated a root-mean-square spot diagram < 8 μm across the full field of view.
  • Obtained an optical transfer function (MTF) > 0.6 at 30 lp/mm.
  • Designed a compact system with dimensions < 90 mm.
  • Employed spherical lenses to reduce manufacturing costs and complexity.

Conclusions:

  • Successfully designed a wide spectral range imaging spectrometer (400-1750 nm) overcoming limitations of traditional designs.
  • The proposed chromatic aberration correction method ensures high spectral resolution and image quality.
  • The miniaturized design with spherical lenses offers a cost-effective, easy-to-install solution for visible and near-infrared spectroscopy.