Terahertz tomography using quantum-cascade lasers
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Hu_Terahertz tomography.pdf
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376.52 KB
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Author(s)
Kao, Tsung-Yu
Hu, Qing
Reno, John L.
Lee, Alan
Burghoff, David Patrick
Date Issued
January 2012
Journal
Optics Letters
Publisher
Optical Society of America
Citation
Wei Min Lee, Alan, Tsung-Yu Kao, David Burghoff, Qing Hu, and John L. Reno. “Terahertz Tomography Using Quantum-Cascade Lasers.” Optics Letters 37, no. 2 (January 15, 2012): 217. © 2012 Optical Society of America
Version
Final published version
Abstract
The interfaces of a dielectric sample are resolved in reflection geometry using light from a frequency agile array of terahertz quantum-cascade lasers. The terahertz source is a 10-element linear array of third-order distributed-feedback QCLs emitting at discrete frequencies from 2.08 to 2.4 THz. Emission from the array is collimated and sent through a Michelson interferometer, with the sample placed in one of the arms. Interference signals collected at each frequency are used to reconstruct an interferogram and detect the interfaces in the sample. Because of the long coherence length of the source, the interferometer arms need not be adjusted to the zero-path delay. A depth resolution of 360 µm in the dielectric is achieved with further potential improvement through improved frequency coverage of the array. The entire experiment footprint is < 1 m × 1 m with the source operated in a compact, closed-cycle cryocooler.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1364/ol.37.000217
