Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator

Klaus Hofbeck; Ekkehard Schomburg; Karl F. Renk; D. G. Pavel'ev; Yu Koschurinov; B. Melzer; Sergei I. Ivanov; Petr S. Kop'ev

doi:10.1117/12.331191

13 November 1998 Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator

Klaus Hofbeck, Ekkehard Schomburg, Karl F. Renk, D. G. Pavel'ev, Yu Koschurinov, B. Melzer, Sergei I. Ivanov, Petr S. Kop'ev

Author Affiliations +

Proceedings Volume 3465, Millimeter and Submillimeter Waves IV; (1998) https://doi.org/10.1117/12.331191
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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 7^th 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, and 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); https://doi.org/10.1117/12.331191

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