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Terahertz-field-induced second-harmonic generation in a beta barium borate crystal and its application in terahertz detection

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3 Author(s)
Chen, Jian ; Center for Terahertz Research, Rensselaer Polytechnic Institute, Troy, New York 12180, USA ; Pengyu Han ; Zhang, X.-C.

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We report the observation of terahertz-field-induced second-harmonic (TFISH) generation in a beta barium borate -BBO) crystal based on a four-wave-mixing process. Using the conventional second-harmonic generation in the β-BBO crystal as a local oscillator, the crossed term between the TFISH and the local oscillator is proportional to the terahertz field. This phenomenon is used for coherent detection of intense terahertz waves, where a good linear response is observed for terahertz fields up to 160 kV/cm. In comparison, deviation from linear response and strong waveform distortion are observed when a 0.5-mm-thick ZnTe detector is used to characterize the same terahertz field.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 1 )