2020
DOI: 10.3390/s20143993
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A Versatile Illumination System for Real-Time Terahertz Imaging

Abstract: Terahertz technologies are attracting strong interest from high-end industrial fields, and particularly for non-destructive-testing purposes. Currently lacking compactness, integrability as well as adaptability for those implementations, the development and commercialisation of more efficient sources and detectors progressively ensure the transition toward applicative implementations, especially for real-time full-field imaging. In this work, a flexible illumination system, based on fast beam steering has been… Show more

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Cited by 16 publications
(6 citation statements)
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“…In this work, we employed a Lytid's teracascade 1000 QCL source. In order to overcome the limiting artifacts induced by the high coherence of such THz QCL sources, and ensure the versatility of the imaging system, the homogeneous illumination in the object plane is performed via a combination of fast beam steering centering purposes, as well [3]. For tomography experiment, the sample is positioned onto a rotation stage and acquisitions were performed in real time.…”
Section: Methodsmentioning
confidence: 99%
“…In this work, we employed a Lytid's teracascade 1000 QCL source. In order to overcome the limiting artifacts induced by the high coherence of such THz QCL sources, and ensure the versatility of the imaging system, the homogeneous illumination in the object plane is performed via a combination of fast beam steering centering purposes, as well [3]. For tomography experiment, the sample is positioned onto a rotation stage and acquisitions were performed in real time.…”
Section: Methodsmentioning
confidence: 99%
“…In this work, Lytid's TeraCascade 1000 QCL source, with an emission power of 1.3 mW at 2.5 THz, has been employed in combination with its integrated autoalignment unit ('AAU' in Fig. 1) to provide a collimated illumination beam through 1" optics [2,60].…”
Section: Experimental Implementationmentioning
confidence: 99%
“…The increasing interest in the terahertz (THz) frequency range in recent decades has given rise to a new branch of techniques and algorithms for the non-contact evaluation of surface and subsurface features of various samples and materials. In this field, THz imaging [1][2][3] represents one of the most promising approaches, since it provides spatially resolved information about the investigated objects. THz phase imaging (THz PI) [4,5], which includes pulse time-domain holography (PTDH) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] as well as continuous wave (CW) holography [23][24][25][26][27][28][29][30], Hartmann wavefront sensing [31][32][33][34][35], shearorgaphy [36], ptychography [37][38][39][40][41], and other phase retrieval techniques [42][43][44][45]...…”
Section: Introductionmentioning
confidence: 99%
“…Homogeneous illumination is one of the wide range of beam shaping challenges. It generally finds application in laboratory tasks requiring full sample area analysis 1 , industrial irradiation 2 , or imaging 3 . In the terahertz (THz) range, it can be applied for specific tasks of sample illumination, e.g., for skin cancer detection 4 or nondestructive testing 5 .…”
Section: Introductionmentioning
confidence: 99%
“…Uniform illumination can be obtained with either passive or active approaches. The latter usually focuses on scrambling phase distribution or scanning the sample areas with, e.g., a swiveling mirror 3 , 7 , which implies the addition of moving elements into a setup. Depending on an application, mechanical vibrations from moving elements and total scrambling of the phase of the wavefront might be undesirable.…”
Section: Introductionmentioning
confidence: 99%