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Terahertz hyperspectral imaging with dual chip-scale combs

Author(s): Sterczewski, Lukasz A; Westberg, Jonas; Yang, Yang; Burghoff, David; Reno, John; et al

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Abstract: Hyperspectral imaging is a spectroscopic imaging technique that allows for the creation of images with pixels containing information from multiple spectral bands. At terahertz wavelengths, it has emerged as a prominent tool for a number of applications, ranging from nonionizing cancer diagnosis and pharmaceutical characterization to nondestructive artifact testing. Contemporary terahertz imaging systems typically rely on nonlinear optical downconversion of a fiber-based near-infrared femtosecond laser, requiring complex optical systems. Here, we demonstrate hyperspectral imaging with chip-scale frequency combs based on terahertz quantum cascade lasers. The dual combs are freerunning and emit coherent terahertz radiation that covers a bandwidth of 220 GHz at 3.4 THz with ~10 µW per line. The combination of the fast acquisition rate of dual-comb spectroscopy with the monolithic design, scalability, and chip-scale size of the combs is highly appealing for future imaging applications in biomedicine and the pharmaceutical industry.
Publication Date: 20-Jun-2019
Citation: Sterczewski, Lukasz A, Westberg, Jonas, Yang, Yang, Burghoff, David, Reno, John, Hu, Qing, Wysocki, Gerard. (2019). Terahertz hyperspectral imaging with dual chip-scale combs. OPTICA, 6 (6), 766 - 771. doi:10.1364/OPTICA.6.000766
DOI: doi:10.1364/OPTICA.6.000766
ISSN: 2334-2536
Pages: 766 - 771
Type of Material: Journal Article
Journal/Proceeding Title: OPTICA
Version: Author's manuscript

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