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29 April 1999 Sideband generators for submillimeter-wave applications
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Sideband generation is a method for producing tunable sources in the far IR frequency range by mixing a tunable microwave source with a fixed laser source to produce tunable sidebands. A 36 element array of planar Schottky diodes was used to mix the output of a CO2 pumped laser at 1.6 THz with a 1-20 GHz microwave source to generate 5.9 (mu) W of DSB power for a conversion efficiency of 28 dB. The array produces sidebands by modulating the amplitude of the laser with a low duty cycle and no matching network which is not the optimal condition. For unmatched conditions at 180 degree phase modulation by a square wave with a 50 percent duty cycle will provide 4 dB SB conversion efficiency. This can be implemented by resonating an inductor with a varactor to obtain a short circuit and then modulating away form resonance for an open circuit. A proof of principle demonstration was implemented in waveguide at 80 GHz which resulted in 9 dB conversion efficiency for sinusoidal phase modulation and about 3 GHz bandwidth. This technique will be attempted at 1.6 THz in waveguide.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David S. Kurtz, Robert M. Weikle II, Thomas W. Crowe, and Jeffrey L. Hesler "Sideband generators for submillimeter-wave applications", Proc. SPIE 3617, Terahertz Spectroscopy and Applications, (29 April 1999);

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