14 December 1992 Mode locking in a closed cavity gyrotron oscillator
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Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19296F (1992) https://doi.org/10.1117/12.2298348
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States
Abstract
Predictions of synchronous mode locking are reported for the first time in a closed-cavity free-electron device. Quasi-linear theory (correct through third order terms) indicates that mode locking is possible in a closed cavity gyrotron by modulating the velocity of the electron beam. A novel feature of this system is that the electrodynamic structure (the cavity with cylindrical cross-section) is dispersive. This results in a spectrum of unequally spaced TEi in modes. This is in contrast to previous mode locked devices (lasers) which have a nearly uniform frequency spacing between modes. In the gyrotron, it is possible to compensate for the structure by utilizing the dispersion of the electron beam (which is of the same order as that of the cavity). Here we demonstrate that subnanosecond radiation pulses at 16 GHz with power levels an order of magnitude above the time-averaged free-running multimode power should be possible from conventional gyrotron structures by mode locking the lowest eight TEi in modes.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. H. McCurdy, A. H. McCurdy, } "Mode locking in a closed cavity gyrotron oscillator", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19296F (14 December 1992); doi: 10.1117/12.2298348; https://doi.org/10.1117/12.2298348
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