Linewidth of submillimeter wave flux‐flow oscillators

Submillimeter Backward Wave Oscillators

NASA Lewis Research Center is engaged in a program to develop a series of backward wave osci l la tors (BWO's) for the frequency range 500 to 2000 GHz. Generically BWO's are electron beam travel ing wave tubes operating in a dispersive regime in which the group velocity and the phase veloci ty of the induced electromagnetic wave are in opposite direct ions. The osc i l la t ion frequency of a B...

Development of Efficient Backward Wave Oscillators for Submillimeter Applications

Calabazas Creek Research, Inc. is funded by the National Aeronautics and Space Administration to develop efficient, light-weight, backward wave oscillators (BWOs) for applications from 300 GHz to 1 THz. These devices are needed as local oscillator (LO) sources in heterodyne receivers. Very low noise heterodyne receivers are needed at submillimeter wavelengths for low-background radioastronomy o...

Continuous-wave Submillimeter-wave Gyrotrons.

Recently, dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP/NMR) has emerged as a powerful technique to obtain significant enhancements in spin spectra from biological samples. For DNP in modern NMR systems, a high power continuous-wave source in the submillimeter wavelength range is necessary. Gyrotrons can deliver tens of watts of CW power at submillimeter wavelengths and ...

Millimeter and Submillimeter Wave Applications

Many applications of millimeter and submillimeter wave systems have been suggested in the literature but, in general, they have not yet beea employed in practice to any significant degree. This report discusses the advantages and limitations of this frequency region and reviews the potential applications under the categories of radar, communications, radiometry and instrumentation. One of the p...

Spectral linewidth of autonomous and injection-locked flux-flow oscillators.