Imaging techniques for a high-power THz free electron laser

Cherkassky, V.S.; Knyazev, B. A.; Kubarev, V. V.; Kulipanov, G. N.; Kuryshev, G. L.; Матвеенко, А. В.; Petrov, A. K.; Popik, V. M.; Scheglov, M.A.; Shevchenko, O.A.; Винокуров, Н.А.

doi:10.1016/j.nima.2005.01.122

Cited by 47 publications

(17 citation statements)

References 2 publications

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“…In the simple thermo-optic model [20,26] it was assumed that this temperature modulation gives rise to a modulation of the optical birefringence Δn through the linear relation…”

Section: Simple Thermal Model and Analysismentioning

confidence: 99%

Detection of terahertz frequency radiation via the photothermoelastic response of zincblende crystals

et al. 2013

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We present experimental evidence for a photothermoelastic response in zincblende crystals illuminated by quantum cascade laser sources in the frequency range 2.2-2.9 THz. Results obtained using an optically balanced sampling arrangement indicate a mechanism whereby the stress distribution established through localized heating of the crystal induces a change in optical birefringence via the photoelastic response of the crystal. A full mathematic model of this photothermoelastic mechanism in (110)-orientated crystals is presented, and shown to agree well with experimental measurements of the magnitude, and the orientational and spatial dependencies of the sampled signal in ZnTe and GaP crystals.

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“…In the simple thermo-optic model [20,26] it was assumed that this temperature modulation gives rise to a modulation of the optical birefringence Δn through the linear relation…”

Section: Simple Thermal Model and Analysismentioning

confidence: 99%

Detection of terahertz frequency radiation via the photothermoelastic response of zincblende crystals

et al. 2013

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“…A liquid-nitrogen-cooled thermal recorder (TR) sensitive to near-infrared radiation (NIR) [16] in combination with a paper sheet used as a screen was the first device applied to the imaging of the NovoFEL radiation [17]. It has a high sensitivity (about 0.1 K) to surface heating and records images with a large repetition rate (25 frames per second).…”

Section: Nir Thermal Recordermentioning

confidence: 99%

“…com/thermal.shtml) for the infrared region was applied to imaging in the terahertz region for the first time in [17]. The principle of the TIP operation is clear from Fig.…”

Section: Temperature-sensitive Phosphor Platementioning

confidence: 99%

“…In the first experiments we used a 160 × 120 array with a germanium window and a 51-μm pixel size. It had a high dynamic range of 4,000 and a sensitivity to 2.3 THz radiation of 33 nW/pixel [17], which is 200 times less than in the MIR region. Since the transmission of the germanium window at the wavelength of l= 130 μm is about 0.3, the subsequent 320 × 240 array was made with a high-resistivity silicon window, the transmission of which is 0.55.…”

Section: Microbolometer Arraymentioning

confidence: 99%

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Real-Time Imaging Using a High-Power Monochromatic Terahertz Source: Comparative Description of Imaging Techniques with Examples of Application

Knyazev

Cherkassky

Choporova

et al. 2011

J Infrared Milli Terahz Waves

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Gradually appearing high-power terahertz sources require the development of adequate imaging techniques. This paper describes four imaging techniques (with a thermal recorder, temperature-sensitive phosphor plates, a visible-light thermal sensitive Fizeau interferometer, and an uncooled microbolometer array) applied with the Novosibirsk terahertz free electron laser as a radiation source. The space and time resolutions of the devices were examined thoroughly. Examples of the application of these techniques, including in-line holography and real-time moving-objects detection, are given.

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“…Smith-Purcell radiation (SPR) is one particularly promising choice for developing such THz sources, which have significant potential applications in many areas, such as high-resolution imaging, noninvasive sensing, high-data rate communications and material analysis [1,2,[4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Zhang

Ang

Gover

2015

Phys. Rev. ST Accel. Beams

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This paper studies various mechanisms to enhance the coherent Smith-Purcell radiation (SPR) at terahertz frequencies using particle-in-cell (PIC) simulations. A simple analytical dispersion relation is derived to predict the frequency of the evanescent surface wave of the open grating, which is excited by a backward-wave oscillation mechanism and emits radiation at harmonics of this frequency, and the cavity mode frequencies of the Orotron-like device, all in excellent agreement with the simulation data. The grating parameters are optimized to minimize the starting current of a continuous electron beam for exciting coherent SPR. It is demonstrated that a prebunched beam can be used to selectively excite coherent SPR at desired SPR angle and frequencies that are higher harmonics of the beam bunching frequency, where the starting current requirement is eliminated. Our PIC simulations show the dynamics of modes development and competition for the Orotron-like open cavity structure, which owns a lower starting current than the surface mode process. This oscillation mode dominates at steady state and enhances the radiated power by more than 2 orders of magnitude.

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Imaging techniques for a high-power THz free electron laser

Cited by 47 publications

References 2 publications

Detection of terahertz frequency radiation via the photothermoelastic response of zincblende crystals

Detection of terahertz frequency radiation via the photothermoelastic response of zincblende crystals

Real-Time Imaging Using a High-Power Monochromatic Terahertz Source: Comparative Description of Imaging Techniques with Examples of Application

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

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