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An electro-optic microwave modulator generating frequency-swept sidebands 26–31 GHz offset from a CO2 laser carrier is described. Resonant enhancement of the modulating field allows as low as 8-mW microwave drive power. Electronic tuning of the resonances by a ferrite phase shifter inside the cavity increases the FWHM modulation bandwidth from 140 MHz (untuned) to 4 GHz.
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Magerl et al. (1979) studied this question.
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