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Proceedings Paper

Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator
Author(s): Klaus Hofbeck; Ekkehard Schomburg; Karl F. Renk; D. G. Pavel'ev; Yu Koschurinov; B. Melzer; Sergei I. Ivanov; Petr S. Kop'ev
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Paper 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.

Paper Details

Date Published: 13 November 1998
PDF: 5 pages
Proc. SPIE 3465, Millimeter and Submillimeter Waves IV, (13 November 1998); doi: 10.1117/12.331191
Show Author Affiliations
Klaus Hofbeck, Univ. Regensburg (Germany)
Ekkehard Schomburg, Univ. Regensburg (Germany)
Karl F. Renk, Univ. Regensburg (Germany)
D. G. Pavel'ev, Nizhny Novgorod State Univ. (Russia)
Yu Koschurinov, Nizhny Novgorod State Univ. (Russia)
B. Melzer, A.F. Ioffe Physical-Technical Institute (Russia)
Sergei I. Ivanov, A.F. Ioffe Physical-Technical Institute (Russia)
Petr S. Kop'ev, A.F. Ioffe Physical-Technical Institute (Russia)

Published in SPIE Proceedings Vol. 3465:
Millimeter and Submillimeter Waves IV
Mohammed N. Afsar, Editor(s)

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