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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Adjustable-resolution static Fourier transform spectrometer based on coherent real light sources.

Xiaolong Li1, Xuzhu Wang1, Xingyu Ren1

  • 1Faculty of Information Science and Engineering, Ocean University of China, Qingdao 266404, China.

The Review of Scientific Instruments
|June 3, 2026
PubMed
Summary

A novel static Fourier transform spectrometer uses real light sources for enhanced performance. This compact, high-resolution instrument achieves tunable spectral resolution and accurate spectral measurements across a broad range.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Instrument Design

Background:

  • Traditional Fourier transform spectrometers often rely on virtual sources and may have limitations in optical throughput and system size.
  • Developing compact, high-resolution spectrometers is crucial for various scientific and industrial applications.

Purpose of the Study:

  • To propose and demonstrate a new static Fourier transform spectrometer design.
  • To achieve high-resolution spectral measurements with a compact and efficient optical system.
  • To enable tunable spectral resolution for diverse applications.

Main Methods:

  • A static Fourier transform spectrometer design utilizing coherent real light sources.
  • Symmetric translation of hollow retroreflectors to control beam shearing distance.
  • Employing lenses to form real-image light sources, replacing virtual sources and enabling beam folding.
  • Utilizing a He-Ne laser and a mercury-argon lamp for performance calibration and testing.

Main Results:

  • Achieved a theoretical spectral resolution of 19.3 cm⁻¹ and a measured resolution of 22.6 cm⁻¹ with a He-Ne laser.
  • Accurate identification of characteristic spectral lines from a mercury-argon lamp with wavelength errors within 0.011%.
  • Successful reconstruction of a continuous spectrum from 385 to 1250 nm.
  • Maintained signal-to-noise ratio (SNR) levels between 25.5 and 31.4 dB under varying shearing distances.

Conclusions:

  • The proposed static Fourier transform spectrometer design offers a compact, high-throughput, and high-resolution spectral measurement solution.
  • The system demonstrates tunable spectral resolution and robust performance, suitable for weak-light and high-resolution conditions.
  • This novel design advances static Fourier transform spectroscopy for broader applicability.