Abstract
THz waveforms generated with an electronic frequency multiplier are sampled with a heterodyne detection technique using a LTG-GaAs photomixer and the optical beat of two near-infrared lasers.
Highlights
IntroductionThe optical heterodyne conversion (photomixing) is a well-established approach used for bridging the terahertz spectral domain
The optical heterodyne conversion is a well-established approach used for bridging the terahertz spectral domain
THz waveforms generated with an electronic frequency multiplier are sampled with a heterodyne detection technique using a LTG-GaAs photomixer and the optical beat of two near-infrared lasers
Summary
The optical heterodyne conversion (photomixing) is a well-established approach used for bridging the terahertz spectral domain. This technique relies on a photoconductor coupled through a planar antenna (photomixer) with a response time in the sub-ps range. It has a quadratic response to the optical fields and an intrinsic non-linear current-voltage dependence. These characteristics have been exploited in direct and heterodyne detection schemes with the photomixer [2]. This contribution demonstrates two asynchronous optical sampling schemes with of the photomixing setup for terahertz pulse measurements
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