Generation of a periodic sequence of powerful ultrashort pulses in a traveling wave tube with bleachable absorber in the feedback loop

Денисов, Г. Г.; Vilkov, M. N.; Zotova, I. V.; Sergeev, A. S.

doi:10.1134/s1063785015090047

Cited by 20 publications

(8 citation statements)

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“…In a joined DFG-RSF project of IAP and IHM, the generation of a periodic sequence of powerful short RF pulses is studied [10]. Simulations for the design of a simple quasi-optical feedback system have been performed at KIT using the KIT code KAR-LESSS [11].…”

Section: Contributions To the Joint Dfg-rsf Project -Generation Of Ulmentioning

confidence: 99%

2018 Status on KIT Gyrotron Activities

et al. 2018

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Section: Contributions To the Joint Dfg-rsf Project -Generation Of Ulmentioning

confidence: 99%

2018 Status on KIT Gyrotron Activities

et al. 2018

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“…I N a joint project of the Russian Science Foundation (RSF) and the Deutsche Forschungsgemeinschaft (DFG), led by the Institute of Applied Physics (IAP-RAS) in Nizhny Novgorod, Russia, and supported by the Institute for Pulsed Power and Microwave Technology (IHM-KIT), the generation of a periodic sequence of coherent, powerful, ultra-short RF pulses is studied [1]. Such powerful pulses of millimeter and sub-millimeter waves can be useful for a number of fundamental problems and practical applications, including novel pulsed Dynamic Nuclear Polarization (DNP)-Nuclear Magnetic Resonance (NMR) spectroscopy, diagnostics of plasmas, photochemistry and biophysics [2], [3], [4].…”

Section: Introductionmentioning

confidence: 99%

“…In [1], it is proposed to transfer the basic principle of a Kerr laser [5], [6] to the millimeter (mm)-wave frequency range to provide a novel source of a periodic sequence of powerful, coherent pulses for mm-waves. In this frequency range, gyrodevices promise the possibility of high power [7].…”

Section: Introductionmentioning

confidence: 99%

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Marek

Avramidis

Illy

et al. 2020

IEEE Trans. Electron Devices

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A new type of high-power pulsed source in the millimeter and sub-millimeter frequency range, utilizing the method of passive mode locking, was proposed in 2015 by the Institute of Applied Physics (IAP-RAS) in Nizhny Novgorod. This principle, well known from laser physics, allows the generation of a periodic series of powerful, coherent, ultra-short pulses. In the millimeter and sub-millimeter wavelength range this can be realized using an amplifier and a saturable absorber coupled in a feedback loop. For the coupling of the two devices, a sophisticated feedback system is required. Such a system, based on simple overmoded waveguide components, was previously proposed by the authors. The present article shows how the proposed feedback system can be extended, allowing for a wide range of possible operation regimes for two coupled gyro-devices. Particularly noteworthy is the application of the modified feedback system for the realization of a two-stage amplifier in the sub-THz range. Furthermore, it seems to be possible to use two helical gyrodevices coupled in the proposed way as a source of coherent pulses, as a free-running or locked CW source, and as a twostage amplifier. In all cases, no design changes of the feedback system are required. Index Terms-sub-THz, high power, ultra-short pulses, passive mode locking, feedback system, quasi-optical.

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“…In a joined DFG-RSF project of the Institute of Applied Physics (IAP-RAS) and the Institute for Pulsed Power and Microwave Technology (IHM-KIT), the generation of a periodic sequence of powerful short RF pulses is studied [1]. Such powerful pulses in the millimeter and sub-millimeter wavelength range can be useful for a large number of fundamental problems and practical applications, including diagnostics of plasmas, photochemistry, biophysics, new locating systems, and spectroscopy of various media.…”

Section: Introductionmentioning

confidence: 99%

“…A periodic sequence of powerful pulses can be generated in a feedback loop consisting of an amplifier and a saturable absorber [1]. The saturable absorber acts as a nonlinear filter which transmits high intensity signals while signals with low intensity are absorbed.…”

Section: Introductionmentioning

confidence: 99%