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Photo-Dember terahertz emitter excited with an Er:fiber laser
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Sketch of the photo-Dember emitter. The laser beam comes from the top (upper area); the generated terahertz radiation is emitted downward (lower area). Every second carrier gradient is suppressed by wedged metal stripes to achieve unidirectional carrier gradients (indicated by the arrows). (b) Scanning electron microscope image of the photo-Dember emitter. On the left an aluminum wall is visible which is covered by a thick gold layer.

Image of FIG. 2.
FIG. 2.

(a) Terahertz transient generated by exciting a photo-Dember emitter with femtosecond pulses from an Er:fiber laser. Balanced electro-optic detection with a thick ZnTe crystal and 20 fs gate pulses results in a maximum relative intensity change of , corresponding to a peak-to-peak electric field of 5 V/cm. (b) Fourier transform of the time-domain data of (a) normalized to the peak value at 0.7 THz. The Fabry–Perot-like pattern stems from multiple reflections in the different substrates; the sharp dips are due to ambient water vapor.

Image of FIG. 3.
FIG. 3.

Power dependence for three different spot sizes at the fundamental wavelength of and for one spot size at the frequency-doubled wavelength of . The peak-to-peak amplitude is in units of the relative intensity changes in the electro-optic detection which remained unchanged for all excitation conditions.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photo-Dember terahertz emitter excited with an Er:fiber laser