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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Published on: December 18, 2015

Terahertz tomography using quantum-cascade lasers.

Alan Wei Min Lee1, Tsung-Yu Kao, David Burghoff

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. awmlee@longwavephotonics.com

Optics Letters
|August 3, 2012
PubMed
Summary
This summary is machine-generated.

This study uses a frequency-agile terahertz quantum-cascade laser array to image dielectric sample interfaces. The system achieves 360 µm depth resolution, enabling non-destructive interface detection.

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Area of Science:

  • Optics and Photonics
  • Solid-State Physics
  • Materials Science

Background:

  • Terahertz (THz) imaging offers non-destructive analysis capabilities.
  • Resolving interfaces in dielectric materials presents challenges for traditional imaging techniques.

Purpose of the Study:

  • To develop a THz imaging method for resolving dielectric sample interfaces.
  • To utilize a frequency-agile terahertz quantum-cascade laser (QCL) array for enhanced depth resolution.

Main Methods:

  • A 10-element linear array of distributed-feedback QCLs emitting from 2.08 to 2.4 THz was employed.
  • The THz light was collimated and directed through a Michelson interferometer with the sample in one arm.
  • Interference signals at discrete frequencies were collected to reconstruct an interferogram and identify interfaces.

Main Results:

  • The system successfully resolved interfaces in a dielectric sample using reflection geometry.
  • A depth resolution of 360 µm was achieved in the dielectric material.
  • The experimental setup has a compact footprint (<1 m × 1 m) and utilizes a closed-cycle cryocooler.

Conclusions:

  • Frequency-agile THz QCL arrays provide a viable method for non-destructive interface resolution in dielectrics.
  • Further improvements in frequency coverage could enhance depth resolution.
  • The compact and efficient design facilitates practical applications in materials analysis.