Gyrotrons for High-Power Terahertz Science and Technology at FIR UF

Idehara, T.; Sabchevski, S.

doi:10.1007/s10762-016-0314-5

Cited by 42 publications

(7 citation statements)

References 90 publications

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“…The output power was calibrated by the thermal elevation of a specific amount of water. 39 Since the pulse width is 10−110 ms and repetition frequency used here is 10 Hz, the light is regarded as CW-T-ray.…”

Section: Discussionmentioning

confidence: 99%

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Rattling of Oxygen Ions in a Sub-Nanometer-Sized Cage Converts Terahertz Radiation to Visible Light

et al. 2017

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A simple and robust approach to visualization of continuous wave terahertz (CW-THz) light would open up opportunities to couple physical phenomena that occur at fundamentally different energy scales. Here we demonstrate how nanoscale cages of CaAlO crystal enable conversion of CW-THz radiation to visible light. These crystallographic cages are partially occupied with weakly bonded oxygen ions and give rise to a narrow conduction band that can be populated with localized, yet mobile electrons. CW-THz light excites a nearly stand-alone rattling motion of the encaged oxygen species, which promotes electron transfer from them to the neighboring vacant cages. When the power of CW-THz light reaches tens of watts, the coupling between forced rattling in the confined space, electronic excitation and ionization of oxygen species, and corresponding recombination processes result in emission of bright visible light.

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Section: Discussionmentioning

confidence: 99%

“…The output beam was converged to approximately 5 mm in diameter by the convergent waveguide. The output power was calibrated by the thermal elevation of a specific amount of water . Since the pulse width is 10–110 ms and repetition frequency used here is 10 Hz, the light is regarded as CW-T-ray.…”

Section: Methodsmentioning

confidence: 99%

Rattling of Oxygen Ions in a Sub-Nanometer-Sized Cage Converts Terahertz Radiation to Visible Light

et al. 2017

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“…At FIR UF, a series of CW gyrotrons (the so-called FU CW series) has been developed [23,26,67,68]. They occupy a wide area in the parameters space of the output power and frequency and are being used in various studies ranging from materials processing and characterization to novel medical technologies.…”

Section: Dnp-nmr and Esr Spectroscopymentioning

confidence: 99%

The Gyrotrons as Promising Radiation Sources for THz Sensing and Imaging

et al. 2020

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The gyrotrons are powerful sources of coherent radiation that can operate in both pulsed and CW (continuous wave) regimes. Their recent advancement toward higher frequencies reached the terahertz (THz) region and opened the road to many new applications in the broad fields of high-power terahertz science and technologies. Among them are advanced spectroscopic techniques, most notably NMR-DNP (nuclear magnetic resonance with signal enhancement through dynamic nuclear polarization, ESR (electron spin resonance) spectroscopy, precise spectroscopy for measuring the HFS (hyperfine splitting) of positronium, etc. Other prominent applications include materials processing (e.g., thermal treatment as well as the sintering of advanced ceramics), remote detection of concealed radioactive materials, radars, and biological and medical research, just to name a few. Among prospective and emerging applications that utilize the gyrotrons as radiation sources are imaging and sensing for inspection and control in various technological processes (for example, food production, security, etc). In this paper, we overview the current status of the research in this field and show that the gyrotrons are promising radiation sources for THz sensing and imaging based on both the existent and anticipated novel techniques and methods.

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“…Nowadays terahertz (THz) electromagnetic radiation finds wide application in science and technology, including bio-medical investigations, high-resolution spectroscopy, meteorology, accelerator physics, security systems, space research and others. Gyrotrons operated at the second harmonic of cyclotron frequency are among the most promising radiation sources for these applications [1]. This is explained by high output power, relatively small size and reasonable cost of present-day sub-THz gyrotrons.…”

Section: Introductionmentioning

confidence: 99%

MODE SELECTION BY OHMIC LOSSES IN LONGITUDINALLY CORRUGATED CAVITIES OF SUB-THz SECOND-HARMONIC GYROTRONS

Tkachova¹,

Shcherbinin²,

Ткаченко³

2019

Problems of Atomic Science and Technology

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Ohmic wall losses are proposed as a means for improving the mode selection in a cylindrical gyrotron cavity with longitudinal wedge-shaped corrugations. Such losses depend on mode frequency and geometrical parameters of the corrugations. For cavity of the 0.4-THz second-harmonic gyrotron we find the corrugation depth, which corresponds to maximum ohmic losses of the competing modes excited at the first (fundamental) cyclotron resonance, as well as to reasonably low losses of the operating mode. For this depth, we determine the number of corrugations and their width, which ensure the maximum enhancement of the ohmic wall losses of the fundamental modes with respect to those of the operating second-harmonic mode, together with minimum conversion of the operating second-harmonic mode to higher Bloch harmonics. Parameters of the corrugations in hand are practicable.

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Gyrotrons for High-Power Terahertz Science and Technology at FIR UF

Cited by 42 publications

References 90 publications

Rattling of Oxygen Ions in a Sub-Nanometer-Sized Cage Converts Terahertz Radiation to Visible Light

Rattling of Oxygen Ions in a Sub-Nanometer-Sized Cage Converts Terahertz Radiation to Visible Light

The Gyrotrons as Promising Radiation Sources for THz Sensing and Imaging

MODE SELECTION BY OHMIC LOSSES IN LONGITUDINALLY CORRUGATED CAVITIES OF SUB-THz SECOND-HARMONIC GYROTRONS

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