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(Color online) The lower sketch shows the normally used crystal with an exit cut (Cherenkov-cut). A silicon prism coupler is attached to the surface of the rectangular cut crystal in the upper sketch. In both setups a perpendicular emission of terahertz radiation occurs. The same interaction length is used in every measurement.
(Color online) The electrical field was measured with a TDS system. Because of the comparison of different emitting geometries and directions, minor changes in setup were necessary.
(Color online) The Fourier transform of the electrical field shows the spectral amplitude.
(Color online) The measured bolometer signal was detected as a function of the chopper signal. The signal obtained in single-pass geometry is shown as comparison to spike of the increased THz signal in the resonant case.
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