Optical elements for focusing of terahertz laser radiation in a given two-dimensional domain

Агафонов, А. Н.; Володкин, Б. О.; Volotovskiy, S. G.; Кавеев, А. К.; Knyazev, B. A.; Кропотов, Г. И.; Tykmakov, K. N.; Pavelyev, V. S.; Tsygankova, E. V.; Tsypishka, D. I.; Choporova, Yu. Yu.

doi:10.3103/s1060992x14030023

Cited by 16 publications

(2 citation statements)

References 11 publications

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“…A good overview of the recently invented terahertz optical structures based on diffraction design is presented in [ 46 ]. The fabricated diffractive optical elements (DOEs) were used to focus [ 42 , 43 , 47 , 48 , 49 ] and split [ 45 , 50 , 51 ] the terahertz laser beam, as well as to control the transverse-mode composition of the beam [ 52 , 53 , 54 ]. In particular, silicon binary elements were used to transform the illuminating beam of a high-power free-electron terahertz laser into the Hermite–Gaussian, Laguerre–Gaussian, and Bessel single-mode beams [ 52 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Pavelyev

Хонина

Degtyarev

et al. 2023

Sensors

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Coherent terahertz beams with radial polarization of the 1st, 2nd, and 3rd orders have been generated with the use of silicon subwavelength diffractive optical elements (DOEs). Silicon elements were fabricated by a technology similar to the technology used before for the fabrication of DOEs forming laser terahertz beams with pre-given mode content. The beam of the terahertz Novosibirsk Free Electron Laser was used as the illuminating beam. The experimental results are in good agreement with the results of the computer simulation.

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Section: Introductionmentioning

confidence: 99%

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Pavelyev

Хонина

Degtyarev

et al. 2023

Sensors

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“…In our previous works, we have designed and manufactured a wide range of diffractive optical elements (DOEs), including binary and continuous-relief elements, for the control of high-power terahertz radiation. These elements include focusing elements [49][50][51], elements for generating beams with different mode compositions [52], elements for concentrating terahertz radiation into specific two-or three-dimensional domains [53,54], sub-wavelength metastructures that produce vector beams with different polarization states [55,56], and others. When DOEs are used to transform the mode content of a beam, they can be considered computer-synthesized holograms [57,58].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Bessel Beams Formed by Binary and Holographic Axicons

et al. 2023

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The characteristics of high-power vortex Bessel beams in the terahertz range (λ=141 μm) obtained with the use of diffractive axicons (DAs) illuminated by a Gaussian beam of the Novosibirsk free-electron laser were studied. Two of the three possible types of DA recently described in our previous paper, namely, binary spiral silicon axicons (BAs), forming beams with a topological charge l equal to 0–4 and 9, and a diamond “holographic” axicon (HA), forming a beam with l=9, were used in the experiments. These axicons formed beams whose cross sections in the region of inner Bessel rings were close to those of ideal Bessel beams, but their intensities varied in azimuth with a frequency of l and 2l for the BAs and HA, respectively. However, in the case of the BAs, the beams had a pronounced helical structure at the periphery, whereas for the HA, the beam was axisymmetric. By focusing these beams with a lens, we studied the structure of the so-called “perfect” beams (PBs). While an ideal Bessel beam exhibits a PB as a thin ring, in the case of the BAs, we observed a broadened ring structure consisting of 2l short spirals, and for the HA, we observed a narrow ring with 2l maxima in azimuth. A comparison of the numerical calculations and experiments showed that the observed azimuthal intensity variations can be attributed to inaccuracies in the preparation of the axicon relief and/or discrepancies between the calculated and actual wavelengths, within a few percent. The results of this work enable the establishment of quality requirements for axicon manufacture and the appropriate selection of the axicon type in accordance with the requirements for the beam.

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Fabrication and characterization of diffractive phase plates for forming high-power terahertz vortex beams using free electron laser radiation

et al. 2016

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Optical elements for focusing of terahertz laser radiation in a given two-dimensional domain

Cited by 16 publications

References 11 publications

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Terahertz Bessel Beams Formed by Binary and Holographic Axicons

Fabrication and characterization of diffractive phase plates for forming high-power terahertz vortex beams using free electron laser radiation

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