Wideband electronic frequency tuning for orotrons

Coherent light generators – Free electron laser

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372 9, 372 15, 372 20, 372108, 372 99, 372102, 315 36, 315 3, 315 4, 315 5, H01S 300

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048295272

ABSTRACT:
An orotron for generating near millimeter wavelength radiation at a selectable output frequency within a wide frequency range, in which the orotron output power is automatically tuned electronically at the selected output frequency. A piezoelectric electromechanical positioning device is connected between the two mirrors forming the open resonator of the orotron to determine the mirror separation in accordance with a position control signal. The electron beam acceleration voltage, which determines the orotron output frequency, and the position control signal are adjusted simultaneously so as to tune the output power at a single oscillation mode of the orotron resonator over a wide frequency range. In the preferred embodiment, the actual output frequency is detected and compared with the selected output frequency, and the beam acceleration voltage and mirror separation simultaneously adjusted to continuously tune and maintain the orotron output at the selected frequency.

REFERENCES:
patent: 4286230 (1981-08-01), Morrison et al.
Leavitt et al.; "Millimeter-Wave Orotron Oscillatron-Part 1: Theory" IEEE E, vol. 17, No. 8, Aug. 1981.
Wortman et al., "Millimeter-Wave Orotron Oscillation-Part II; Experiment". IEEE JQE, vol. 17, No. 8, Aug. 1981.
Resin et al. "Orotron-An Electronic Oscillator with an Open Resonator and Reflecting Orating", Pro. IEEE, Apr. 69.

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