1 May 2014 Electrical nonlinear response of a photomixer for applications in ultrafast measurements
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Electrical nonlinear response of a low-temperature-grown GaAs photomixer is exploited for THz-wave modulation, detection and waveform sampling. Current-voltage response at low bias field is modelled by electron drift velocity saturation. THz-wave rectification is discussed in a small-signal approximation and experimentally addressed in connection with the curvature of IV plot. The optical heterodyne signal from two lasers down-converted with the photomixer is modulated by applying an alternative bias field. Conversely, heterodyne detection of a continuous-wave THz source is demonstrated with the photomixer using the optical beat between the lasers as local oscillator. Alternatively, THz-waves with tunable carrier and pulse repetition rate are generated with a THz frequency multiplier driven by a pulsed microwave synthesizer. Asynchronous optical sampling with a pulsed optical beat is demonstrated with the heterodyne detection scheme.
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Florin L. Constantin, Florin L. Constantin, "Electrical nonlinear response of a photomixer for applications in ultrafast measurements", Proc. SPIE 9136, Nonlinear Optics and Its Applications VIII; and Quantum Optics III, 913620 (1 May 2014); doi: 10.1117/12.2052506; https://doi.org/10.1117/12.2052506


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