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Related Experiment Video

Updated: Jun 17, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Dual-frequency imaging using an electrically tunable terahertz quantum cascade laser.

Paul Dean1, Nor Kamila Saat, Suraj P Khanna

  • 1School of Electronic and Electrical Engineering, University of Leeds, Leeds, LS2 9JT, UK. p.dean@leeds.ac.uk

Optics Express
|December 10, 2009
PubMed
Summary
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Dual-frequency terahertz (THz) imaging using a quantum cascade laser (QCL) distinguishes materials by their unique absorption spectra. This technique enables clear differentiation of various polycrystalline samples, including explosives.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Terahertz (THz) imaging offers unique capabilities for non-destructive analysis of materials.
  • Distinguishing between similar polycrystalline materials can be challenging with conventional imaging methods.

Purpose of the Study:

  • To develop and demonstrate a dual-frequency THz transmission imaging technique for enhanced material differentiation.
  • To utilize the spectral absorption features of materials in the THz range for identification.

Main Methods:

  • Employing an electrically tunable terahertz (THz) frequency quantum cascade laser (QCL) for dual-frequency (3.05 THz and 3.24 THz) imaging.
  • Acquiring transmission images of polycrystalline samples in a single 2D scan.
  • Calculating the difference-attenuation coefficient from transmission data and performing difference-intensity imaging using amplitude modulation and lock-in detection.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Last Updated: Jun 17, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Main Results:

  • Successfully obtained dual-frequency THz transmission images of lactose monohydrate, glucose monohydrate, sucrose, and PETN.
  • Demonstrated the ability to distinguish these materials based on their specific THz absorption spectra.
  • Validated the effectiveness of the difference-attenuation coefficient and difference-intensity imaging for material identification.

Conclusions:

  • Dual-frequency THz transmission imaging with a tunable QCL is a powerful technique for differentiating polycrystalline materials.
  • The method leverages unique molecular absorption signatures in the THz spectrum for sensitive material analysis.
  • This approach holds promise for applications in materials science, security screening, and quality control.