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Static, refractive and monolithic Fourier transform spectrometer: development and prototyping.

Fabio Frassetto1, Lorenzo Cocola2, Paola Zuppella3

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This study introduces a novel monolithic Fourier transform spectrometer using Littrow

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Instrument Development

Background:

  • Static Fourier transform spectrometers are typically monolithic assemblies.
  • Existing grating-based designs use beam-splitters and diffraction gratings with spacers.

Purpose of the Study:

  • To develop and test an alternative monolithic static Fourier transform spectrometer.
  • To create a more robust and compact instrument using Littrow's prisms.

Main Methods:

  • Developed a monolithic structure by gluing Littrow's prisms to a beam-splitter.
  • Eliminated air gaps and spacers for increased robustness and miniaturization.

Main Results:

  • The developed spectrometer operates in the visible/near-infrared (470-850 nm).
  • Achieved a variable resolution between 3000 and 300, dependent on glass dispersion.
  • Demonstrated a robust, contamination-protected, and miniaturizable instrument.

Conclusions:

  • The Littrow's prism-based monolithic spectrometer offers enhanced robustness and compactness.
  • This design is suitable for miniaturization and provides effective protection against contamination.