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A wide-field Fourier-transform microscope, based on a compact and ultra-stable birefringent interferometer, allows the parallel acquisition of spectra for all pixels of a 2D detector. The time-domain approach enables the disentanglement of photoluminescence and Raman signals, and allows rapid Raman mapping (~5 ms/pixel) with ~1-µm spatial and 23-cm-1 spectral...
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Related Experiment Video

Updated: Jan 19, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

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Published on: December 30, 2025

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Compact millimeter-wavelength Fourier-transform spectrometer.

Zhaodi Pan, Mira Liu, Ritoban Basu Thakur

    Applied Optics
    |September 11, 2019
    PubMed
    Summary

    We developed a compact Fourier-transform spectrometer (FTS) for terahertz frequencies, achieving high optical throughput and spectral resolution. This instrument offers a simplified design for advanced spectroscopic applications.

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    Area of Science:

    • Physics
    • Spectroscopy
    • Engineering

    Background:

    • Fourier-transform spectrometers (FTS) are crucial for analyzing electromagnetic radiation.
    • Existing FTS designs often face limitations in size, weight, or optical throughput.
    • The terahertz frequency range (50 GHz to 330 GHz) requires specialized instrumentation.

    Purpose of the Study:

    • To design and construct a compact, high-performance Fourier-transform spectrometer.
    • To optimize the FTS for maximum optical throughput and spectral resolution within a minimal volume and weight.
    • To provide a versatile instrument for terahertz spectroscopy.

    Main Methods:

    • Construction of a polarizing Martin-Puplett interferometer.
    • Minimization of instrument volume (355×260×64 mm) and weight (5.9 kg).
    • Maximization of optical throughput (100 mm² sr) and optimization of spectral resolution (4 GHz).

    Main Results:

    • A functional FTS operating between 50 GHz and 330 GHz was successfully built.
    • The instrument features a simple design with mirrors milled on box walls and a single motorized stage.
    • Performance characterization confirmed the FTS meets design specifications, validated by optical simulations.

    Conclusions:

    • The developed FTS offers a unique combination of compactness, high throughput, and spectral resolution.
    • The simplified design and accessible software/code facilitate its use in various research areas.
    • This instrument advances the capabilities for terahertz spectroscopic analysis.