Investigation of spectral encoding with terahertz broadband uniformly topologically charged beams

Tsiplakova, Elizaveta G.; Kulya, Maksim S.; Sokolenko, Bogdan V.; Gorodetsky, Andrei; Petrov, Nikolay V.

doi:10.1109/irmmw-thz50926.2021.9567118

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…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][46][47][48][49], ...…”

Section: Introductionmentioning

confidence: 99%

“…A lot of technical solutions, experimental layouts, and reconstruction algorithms for THz PI have been proposed, and this field is reaching a certain level of maturity [5]. THz PTDH provides ultimate opportunities to track the dynamics of all the characteristics of a broadband THz field in spatial, temporal, spectral, and angular coordinates [50] during its interference [18,19,21] and propagation, both in free space [9,12,17,22], through designed optical elements [51], obstacles [13,20], and investigated objects [8,10,11,16]. THz wavefront characterization with subsequent compensation through adaptive optics also serves as a compelling use case [52].…”

Section: Introductionmentioning

confidence: 99%

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Single-scan multiplane phase retrieval with a radiation of terahertz quantum cascade laser

et al. 2022

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Terahertz phase retrieval from a set of axially separated diffractive intensity distributions is a promising single-beam computational imaging technique that ensures the obtention of high spatial resolutions and phase wavefronts, but remains restricted by time-consuming data acquisition processes. In this work, we have adopted an approach, relying on the radiation of a quantum cascade laser and the implementation of an express single-scan measurement of intensity distributions through the continuous on-the-go displacement of a high-sensitivity antenna-coupled microbolometer sensor array. In addition to the simplicity of this practical implementation and the minimization of measurement times, such an approach overcomes the problem of preliminary optimal selections of transverse intensity distributions used in the iterative phase retrieval algorithm and guarantees the required data diversity for high-quality wavefront reconstruction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-scan multiplane phase retrieval with a radiation of terahertz quantum cascade laser

et al. 2022

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Open-source 3D-printed terahertz pulse time-domain holographic detection module

2022

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We present a holographic detection module to measure the spatially resolved distribution of pulsed terahertz field in a single scan by a motorized translation stage, responsible for the time delay. All mounts of the optical elements of the module are easily reproduced by 3D printing and attached to the optical cage system. The latter greatly simplifies the measurement procedure, allowing the experimenter to move and adjust the detection system as a single device. The developed mounts are made universal and can be used in other setups. We have made 3D models available as open-source hardware. The module is based on an electro-optical detection scheme with wide-aperture ZnTe crystal, crossed polarizers, and a matrix photodetector. The validation of its operability was performed with two experiments to measure the spatial distribution of the unperturbed field from the generator and the vortex field formed by the spiral phase plate. Optical vortices with multiple topological charges of 2–4 were detected on spectral components in the range from 0.3 to 1.1 THz. In addition, we have detailed the alignment process of terahertz imaging systems.

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Design of broadband terahertz vector and vortex beams: I. Review of materials and components

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

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In this paper, we review the existing approaches for vortex and vector beam shaping and generation in the terahertz frequency range. The particular focus of this review is on the possibility of homogeneous topological charge formation in the ultra-wide spectral interval inherent to ultrashort terahertz pulses. We review the available materials and components, analyse proposed and potentially possible solutions for broadband terahertz vortex and vector beam shaping, compare all developed approaches, and put forward a unified concept for constructing passive shapers of such beams from the existing component base.

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Investigation of spectral encoding with terahertz broadband uniformly topologically charged beams

Cited by 3 publications

References 7 publications

Single-scan multiplane phase retrieval with a radiation of terahertz quantum cascade laser

Single-scan multiplane phase retrieval with a radiation of terahertz quantum cascade laser

Open-source 3D-printed terahertz pulse time-domain holographic detection module

Design of broadband terahertz vector and vortex beams: I. Review of materials and components

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