A multifunctional microwave Gunn oscillator for magnetic resonance spectroscopy applications

摘要

A waveguide Gunn oscillator operating in the 12-mm wavelength range, in which the gyromagnetic frequency tuning is carried out using a FeBO{sub}3 antiferromagnetic single crystal, is described. To increase the output power, the pulsed power supply of the Gunn diode is employed. In the case of a microwave pulse duration of 0.1-50μs and off-duty factor of no less than 200, the pulse output power reaches ～1.3 W (in the continuous mode, it is 0.3 W). The generator is developed for magnetic resonance spectroscopy applications in order to solve a wide circle of problems, including investigations of the nonlinear spin dynamics of magnetic materials and study of spectra of optical magnetic-resonance detection.