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Coherent detection of terahertz pulses based on two-photon absorption in a photodiode

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2 Author(s)
Schneider, A. ; Nonlinear Optics Laboratory, Institute of Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland ; Gunter, P.

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The authors present a simple and robust method for the measurement of the terahertz-induced lensing effect that may be used for the coherent detection of few-cycle terahertz pulses. It is based on two-photon absorption of a 1.5 μm probe pulse in a standard silicon photodiode. The change in the spatial probe pulse profile caused by terahertz-induced lensing leads to a variation of the diode signal that is induced by two-photon absorption even though the total pulse energy has remained constant. This variation is shown to be proportional to the terahertz electric field.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 12 )