Investigation of the Frequency Double-Multiplication Effect in a Sub-THz Gyrotron

Glyavin, M. Yu.; Zotova, I. V.; Rozental, R. M.; Malkin, A. M.; Sergeev, A. S.; Fokin, A. P.; Rumyantsev, V. V.; Morozov, S. V.

doi:10.1007/s10762-020-00726-x

Cited by 21 publications

(3 citation statements)

References 14 publications

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“…The structure was mounted at the end of the waveguide insert inside a compact superconducting magnet. The magnetic field was varied from 0 to 3 T, while the radiation frequency was fixed at 526 GHz.We used the second harmonic of the sub-THz gyrotron operating at 263 GHz as the exciting radiation [ 28 ], providing highly stable intensity. A gapless HgCdTe epilayer was exploited as the detector, with sensitivity comparable to an InSb hot electron bolometer [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Optical Studies and Transmission Electron Microscopy of HgCdTe Quantum Well Heterostructures for Very Long Wavelength Lasers

et al. 2021

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HgTe/CdHgTe quantum well (QW) heterostructures have attracted a lot of interest recently due to insights they provided towards the physics of topological insulators and massless Dirac fermions. Our work focuses on HgCdTe QWs with the energy spectrum close to the graphene-like relativistic dispersion that is supposed to suppress the non-radiative Auger recombination. We combine various methods such as photoconductivity, photoluminescence and magneto-optical measurements as well as transmission electron microscopy to retrofit growth parameters in multi-QW waveguide structures, designed for long wavelengths lasing in the range of 10–22 μm. The results reveal that the attainable operating temperatures and wavelengths are strongly dependent on Cd content in the QW, since it alters the dominating recombination mechanism of the carriers.

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Section: Methodsmentioning

confidence: 99%

Optical Studies and Transmission Electron Microscopy of HgCdTe Quantum Well Heterostructures for Very Long Wavelength Lasers

et al. 2021

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“…Это обусловлено, с одной стороны, неэквидистантностью спектра мод цилиндрических волноводов, типично используемых в гиротронах, а с другойбыстрым спаданием коэффициентов связи с увеличением номера гармоники. В частности, проведенные в [7,8] измерения мощности для гиротрона с рабочей частотой 263 GHz показали, что значения КНТ на второй циклотронной гармонике составили 10 −4 (т. е. около 0.01% от мощности излучения на первой гармонике), а для третьей -около 10 −6 (0.0001%).…”

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Возбуждение Высоких Циклотронных Гармоник В Сильноточном Релятивистском Гиротроне В Режиме Умножения Частоты

Леонтьев¹,

Розенталь²,

Гинзбург³

et al. 2022

Письма В Журнал Технической Физики

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Using the averaged equations supplemented with 3D particle-in-cells simulation methods, we study the frequency multiplication regime in high-current relativistic gyrotron. We show that the ratio between the output power of the higher (fifth or sixth) harmonics and that on the fundamenta cyclotron resonance may be of about 0.1-0.3%. Accordingly, the nonlinear transformation coefficient as several orders higher than the values achievable in gyrotrons with weakly relativistic electron beams.

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“…This is caused, on the one side, by an unequal spacing of the cylindrical waveguide spectrum modes and, on the other side, by a rapid decrease in the coupling coefficients with increasing harmonic number. For instance, presented in [7,8] power measurements for the gyrotron with operating frequency of 263 GHz showed that the NTC value at the second cyclotron harmonic was 10 −4 (i. e. about 0.01% of the first-harmonic radiation power) while that at the third cyclotron harmonic was about 10 −6 (0.0001%).…”

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Excitation of high cyclotron harmonics in a high-current relativistic gyrotron in the frequency multiplication regime

A.N

R.M.

N.S.

et al. 2022

Technical Physics Letters

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Using the averaged equations supplemented with 3D particle-in-cells simulation methods, we have studied the frequency multiplication regime in a high-current relativistic gyrotron. The paper shows that the ratio between the output power of the higher (fifth or sixth) harmonics and that of the fundamental cyclotron resonance may be of about 0.1-0.3%. Accordingly, the nonlinear transformation coefficient is several orders of magnitude higher than the values achievable in gyrotrons with weakly-relativistic electron beams. Keywords: gyrotron, harmonic excitation, high-current relativistic electron beams.

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Investigation of the Frequency Double-Multiplication Effect in a Sub-THz Gyrotron

Cited by 21 publications

References 14 publications

Optical Studies and Transmission Electron Microscopy of HgCdTe Quantum Well Heterostructures for Very Long Wavelength Lasers

Optical Studies and Transmission Electron Microscopy of HgCdTe Quantum Well Heterostructures for Very Long Wavelength Lasers

Возбуждение Высоких Циклотронных Гармоник В Сильноточном Релятивистском Гиротроне В Режиме Умножения Частоты

Excitation of high cyclotron harmonics in a high-current relativistic gyrotron in the frequency multiplication regime

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