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Related Experiment Video

Updated: Jan 21, 2026

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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Spatial Heterodyne Raman Spectrometer (SHRS) for In Situ Chemical Sensing Using Sapphire and Silica Optical Fiber

Joshua M Ottaway1, Ashley Allen2, Abigail Waldron2

  • 1Lawrence Livermore National Laboratory, Livermore, CA, USA.

Applied Spectroscopy
|August 10, 2019
PubMed
Summary
This summary is machine-generated.

A new spatial heterodyne Raman spectrometer (SHRS) was developed for fiber-coupled chemical sensing. This system demonstrates effective Raman measurements of various standards and energetic materials, showcasing its versatility and performance.

Keywords:
FT RamanFourier transform RamanHMXPBXRaman probeRaman spectroscopyTATBoptical fibersapphire fiberspatial heterodyne Raman spectrometer

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Materials Science

Background:

  • Fiber-coupled Raman spectroscopy is crucial for remote chemical analysis.
  • Existing systems face challenges with background noise and spectral resolution.
  • Development of robust and versatile Raman probes is essential for diverse applications.

Purpose of the Study:

  • To describe the construction and utility of a spatial heterodyne Raman spectrometer (SHRS) for fiber-coupled measurements.
  • To demonstrate the performance of SHRS with both silica and single-crystal sapphire fiber Raman probes.
  • To evaluate the SHRS system for analyzing chemical standards and energetic materials.

Main Methods:

  • A modular spatial heterodyne Raman spectrometer (SHRS) was constructed.
  • Commercial silica and custom single-crystal sapphire fiber Raman probes were utilized.
  • Raman spectra were acquired using 532 nm laser excitation and analyzed via Fourier transform of interferograms.

Main Results:

  • The SHRS system successfully acquired Raman spectra of solid sulfur, liquid cyclohexane, and plastic-bonded explosives (PBX) containing TATB and HMX.
  • Sapphire fiber probes allowed for larger fiber diameters and measurements closer to the excitation laser with reduced background.
  • Well-defined sapphire Raman bands were observed, useful for internal calibration and performance referencing.

Conclusions:

  • The fiber-coupled SHRS is a versatile chemical sensing system with good spectral resolution and throughput.
  • Single-crystal sapphire fiber probes offer advantages over silica fibers, including lower background and suitability for large-diameter fibers.
  • The SHRS system, particularly with sapphire probes, shows promise for analyzing energetic materials and other challenging samples.