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RF Frequency Response of Photoconductive Samplers

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3 Author(s)
Roux, J.-F. ; Lab. d''Hyperfreq., Univ. de Savoie, Paris, France ; Delord, J.-M. ; Coutaz, J.-L.

We derive the microwave bandwidth of ultrafast optoelectronic samplers based on photoconducting switches, using a simple analytical model. The validity of this model is checked by measuring the bandwidth of semi-intrinsic and low-temperature-grown GaAs photoswitches. The bandwidth of such devices is limited by the response time of both the semiconductor material and the electrical circuit. The devices behave as low-pass filters exhibiting a -60 dB/decade slope.

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Quantum Electronics, IEEE Journal of  (Volume:47 ,  Issue: 2 )