4 December 2017 Grating-coupled oscillator experiments at submillimeter/FIR wavelengths
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Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15767U (2017) https://doi.org/10.1117/12.2297995
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland
Abstract
The grating-coupled oscillator (GCO) as configured at Dartmouth has produced coherent, tunable radiation over the wavelength range of 1 cm to 400 microns. This device utilizes a periodic metal grating in conjunction with a mildly relativistic electron beam (15- 130 keV) to produce Smith-Purcell radiation. Confocal mirrors placed at each end of the grating structure form a resonant cavity that allows for the growth of the radiation field to occur, thus enhancing the radiative process. In the past, a TM interaction model has been used to determine operational aspects of the device such as dispersion, electronic tuning, and start oscillation current. Experimental results have been compared in detail to theoretical predictions and excellent agreement has been found. Correlating the TM formalism with the dipole radiation viewpoint of Smith and Purcell has resulted in a deeper understanding of how these devices operate. The Smith-Purcell model suggests that the use of new resonator designs may result in the extension of the wavelength of the device to the 10 micron region.
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E. J. Price, E. J. Price, } "Grating-coupled oscillator experiments at submillimeter/FIR wavelengths", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15767U (4 December 2017); doi: 10.1117/12.2297995; https://doi.org/10.1117/12.2297995
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