论文信息 - Contributions to the Joint DFG-RSF Project - Generation of Ultra-Short Microwave Pulses -

Contributions to the Joint DFG-RSF Project - Generation of Ultra-Short Microwave Pulses -

In a joined DFG-RSF project of the Institute of Applied Physics (IAP-RAS) and the Institute for Pulsed Power and Microwave Technology (IHMKIT), 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. 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. In such a feedback loop, the periodic signal is generated by the mechanism of passive mode-locking. In the millimeter wavelength range, gyro-devices as the gyro-traveling-wave-tube (gyro-TWT) are well suited for the realization of both devices, the amplifier and the nonlinear absorber.

[1] G. Denisov,et al. Ultrawideband Millimeter-Wave Oscillators Based on Two Coupled Gyro-TWTs With Helical Waveguide , 2018, IEEE Transactions on Electron Devices.

[2] Wei Zhang,et al. Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region , 2017, Scientific Reports.

[3] G. Denisov,et al. Generation of trains of ultrashort microwave pulses by two coupled helical gyro-TWTs operating in regimes of amplification and nonlinear absorption , 2017 .

[4] S. Samsonov,et al. Mechanisms of amplification of ultrashort electromagnetic pulses in gyrotron traveling wave tube with helically corrugated waveguide , 2015 .

[5] G. Denisov,et al. Generation of a periodic sequence of powerful ultrashort pulses in a traveling wave tube with bleachable absorber in the feedback loop , 2015 .

[6] Claus-Dieter Munz,et al. Coupled Particle-In-Cell and Direct Simulation Monte Carlo method for simulating reactive plasma flows , 2014 .

[7] G. Denisov,et al. Microwave System for Feeding and Extracting Power To and From a Gyrotron Traveling-Wave Tube Through One Window , 2014, IEEE Electron Device Letters.

[8] Claus-Dieter Munz,et al. Mesh Curving Techniques for High Order Discontinuous Galerkin Simulations , 2015 .