Novosibirsk Free Electron Laser—Facility Description and Recent Experiments

Кулипанов, Г.Н.; Bagryanskaya, Elena G.; Чесноков, Е. Н.; Choporova, Yulia Yu.; Gerasimov, V. V.; Getmanov, Ya. V.; Kiselev, Sergey L.; Knyazev, B. A.; Kubarev, V. V.; Peltek, Sergey E.; Popik, V. M.; Salikova, T. V.; Scheglov, M.A.; Середняков, С. С.; Shevchenko, O.A.; Skrinsky, A.N.; Veber, Sergey L.; Винокуров, Н.А.

doi:10.1109/tthz.2015.2453121

Cited by 163 publications

(51 citation statements)

References 45 publications

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“…To date, vortex beams were obtained in the range from radio frequencies [2] to the soft X-ray radiation [3]. Nevertheless, there are only five studies [4][5][6][7][8], in which vortex beams in the terahertz range have been generated.Recently, using radiation of the Novosibirsk free electron laser [9] and silicon binary spiral phase axicons, terahertz Bessel beams with OAM with topological charges 1 l r and 2 l r have been generated for the first time [7]. The intensity distributions of the beams formed by the axicons are in good agreement with the distributions calculated for Bessel beams, but they are identical for both left-handed and right-handed helicities.…”

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confidence: 55%

Terahertz Bessel beams with orbital angular momentum: diffraction and interference

et al. 2017

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The fact that light beams are able to carry a mechanical angular momentum is well-known. In paraxial beams, angular momentum can be represented as a sum of the spin (SAM) and orbital (OAM) angular momentum. After paper Allen et al.[1], a lot of articles devoted to the generation, study and the use of beams with orbital angular momentum, or "vortex beams", have been published. To date, vortex beams were obtained in the range from radio frequencies [2] to the soft X-ray radiation [3]. Nevertheless, there are only five studies [4][5][6][7][8], in which vortex beams in the terahertz range have been generated.Recently, using radiation of the Novosibirsk free electron laser [9] and silicon binary spiral phase axicons, terahertz Bessel beams with OAM with topological charges 1 l r and 2 l r have been generated for the first time [7]. The intensity distributions of the beams formed by the axicons are in good agreement with the distributions calculated for Bessel beams, but they are identical for both left-handed and right-handed helicities. To determine the characteristics of the beams associated with their rotation, we applied classical experiments on diffraction and interference, adapting them to the terahertz range.A direct method of detecting the rotation of a beam was its diffraction on a half-plane (Fig. 1, a). Similar experiments with Laguerre-Gaussian and Bessel vortex beams were performed in the visible region in [11], where for the Bessel beams only qualitative results were obtained because of the short laser wavelength and the tiny interference pattern.In Fig. 1, b the diffraction patterns calculated numerically at several distances are shown. In the experiments, a 16.32 12.24 u mm 2 microbolometer array (MBA) with pixel size of 0.051 mm was used as a detector for imaging of diffraction pattern. Because of geometrical restrictions, only planes located at a distance z of more than 35 mm could be recorded. The recorded patterns were identical with the calculated ones.The diffraction patterns shown in Fig. 1 clearly demonstrate the rotation of the beam. According to the theory [12], the rate of change of azimuthal angle of the trajectory of the Poynting vector with z is given by 2

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confidence: 55%

Terahertz Bessel beams with orbital angular momentum: diffraction and interference

et al. 2017

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“…The source of radiation in the experiments was the Novosibirsk Free Electron Laser (NovoFEL), which is currently the most powerful source of terahertz radiation in the world 20 and the only source capable of maintaining a continuous terahertz laser discharge. The terahertz NovoFEL was generating a continuous sequence of 70-ps (FWHM) pulses with a repetition rate of 5.6 MHz at a wavelength of 130 µm (2.3 THz frequency).…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Continuous point-like high-temperature laser discharge produced by terahertz free electron laser

2017

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A continuous point-like laser discharge of record high temperature has been produced in argon at atmospheric pressure with focusing of the radiation of the Novosibirsk terahertz free electron laser (NovoFEL). According to spectral measurements, the temperature in the center of the millimeter-sized plasma sphere was 28000 K at a plasma density of 1.5×1017 cm-3 and an average NovoFEL power of 200 W at a wavelength of 130 μm (2.3 THz).

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“…Vortex beams have been formed and investigated in the spectral range from X-ray to radio waves, but only a few publications are devoted to beams with OAM in the terahertz range (see [4] and references therein). In this paper we describe vortex Bessel beams with an average power of 25 W, obtained on the Novosibirsk free-electron laser (NovoFEL) [5].…”

Section: Beam Formationmentioning

confidence: 99%

Wave beams with orbital angular momentum: a step towards terahertz

et al. 2017

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Novosibirsk Free Electron Laser—Facility Description and Recent Experiments

Abstract: The design and operational characteristics of the Novosibirsk free electron laser facility are described. Selected experiments in the terahertz range carried out recently at the user stations are surveyed in brief.

Cited by 163 publications

References 45 publications

Terahertz Bessel beams with orbital angular momentum: diffraction and interference

Terahertz Bessel beams with orbital angular momentum: diffraction and interference

Continuous point-like high-temperature laser discharge produced by terahertz free electron laser

Wave beams with orbital angular momentum: a step towards terahertz

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