Nonlinear Cyclotron Resonance Absorber for a Microwave Subnanosecond Pulse Generator Powered by a Helical-Waveguide Gyrotron Traveling-Wave Tube

New Type of Pulsed High-Power sub-THz Source Based on Helical-Type Gyro-TWTs

“…In the existing literature about the coherence of the signals generated from passive mode-locked oscillators at microwave frequencies, the investigation of phase offsets was neglected until now. Although in [12][13][14] the coherence of the generated pulses was already investigated by a continuous version of the cross-correlation function (1), all considerations were limited to the amplitude of the cross-correlation coefficient while its phase was neglected. As a consequence, the present work concludes with a different result than previous investigations: While the shape of the generated pulses from passive modelocked oscillators is independent of the excitation regime, the phase is sensitive to the excitation regime.…”

Development of W-band short pulse generator with passive mode-locking

“…In laser physics, there exists a well-known principle for production of ultrashort optical pulses (USP), based on the effect of passive mode-locking [1,2], which is achieved by incorporating a saturable absorber into the laser resonator. As it was shown in [3][4][5], a similar method of ultrashort pulse generation can be realized in a two-section microwave oscillator consisting of an amplifier and a nonlinear absorber in the feedback loop.…”

Microwave generators with passive mode-locking

“…This effect is achieved by incorporating a saturable absorber into the laser resonator. The theoretical studies carried out [3][4][5] have shown the possibility of transferring the described method to microwave electronics. The key point for the development of electronic USP generators with passive mode-locking was the development of an absorber that should provide saturable absorption in the microwave range at a power level of tens and hundreds of kilowatts.…”