13 November 1998 Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator
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Abstract
We report on the generation of tunable ultra-narrowband microwave radiation using a frequency locked superlattice oscillator fabricated in a planar design. As active device, a wide-miniband GaAs/AlAs superlattice was used, showing, at room temperature, self-sustained current oscillation giving rise to microwave generation at a natural frequency near 5 GHz and ultraharmonics up to the 7th order; the linewidth of the harmonics was near 1 MHz. We observed a drastic reduction of the linewidths to less than 10 Hz by frequency locking the oscillator (approximately 100 (mu) W) with a weak narrowband driving field (approximately 0.1 (mu) W). The oscillator was tunable within a locking range of 1 percent of the natural frequency. Besides harmonic also subharmonic locking was observed.
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Klaus Hofbeck, Ekkehard Schomburg, Karl F. Renk, D. G. Pavel'ev, Yu Koschurinov, B. Melzer, Sergei I. Ivanov, Petr S. Kop'ev, "Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator", Proc. SPIE 3465, Millimeter and Submillimeter Waves IV, (13 November 1998); doi: 10.1117/12.331191; https://doi.org/10.1117/12.331191
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