Abstract
Electro-optic (EO) sampling is a widely used technique for the measurement of the electric field ETHz of a terahertz (THz) pulse with subpicosecond time resolution [1]. Its frequency description shows that sum (SFG) and difference frequency generation (DFG) processes take place during the interaction of the optical and THz pulses [2]. It has been demonstrated that during the interaction of an optical and an intense THz pulse co-propagating in a <110> cut ZnTe crystal, the optical pulse experiences cross-phase modulation [3]. This results in a modification of the optical spectrum, which depends on the temporal derivative the THz field. However, such a THz-induced cross-phase modulation was only recorded for THz pulses with very high electric fields in the range of 107 V.cm−1. Hereafter, we present the spectral evolution of an optical pulse generated during EO sampling in a <110> cut ZnTe crystal, with a THz electric field amplitude in the range of 104 to105 V. cm−1. We demonstrate that the spectrum of this pulse results from SFG, DFG and cross-phase modulation.
© 2015 IEEE
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