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- W2074300539 abstract "We realized a tunable continuous-wave terahertz source with megahertz frequency resolution. The system is based on optical heterodyning of two near-infrared distributed feedback diode lasers, each laser being stabilized by electronic feedback from a low-finesse quadrature interferometer. The control loop permits precisely linear laser frequency scans over >1200GHz, and a beat signal linewidth of 1MHz at 80ms time scale. Using GaAs photomixers and log-periodic antennae, we achieve a signal-to-noise ratio of the terahertz power of >70dB at 100GHz and 100ms integration time, and still ∼30dB at 1THz. As an example for high-resolution terahertz spectroscopy, we characterize the transmission properties of a subwavelength metal grating." @default.
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- W2074300539 date "2008-04-01" @default.
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- W2074300539 title "Precisely tunable continuous-wave terahertz source with interferometric frequency control" @default.
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- W2074300539 doi "https://doi.org/10.1063/1.2905033" @default.
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