Fig. 4: Scalability of the emission scheme. | Light: Science & Applications

Fig. 4: Scalability of the emission scheme.

From: Scalable high-repetition-rate sub-half-cycle terahertz pulses from spatially indirect interband transitions

Fig. 4

a Comparison of the electric field waveforms generated in two QWEs and a spintronic emitter. Scaling the number of QWs from 20 (black) to 100 (purple) increases the field strength by a factor of 4.7. With field strengths of 0.77 kV cm–1 at MHz repetition rates, the peak field of spintronic emitters (green) is surpassed. b Scaling of the THz peak field with the incident pump-pulse energy. The peak field of the emitter with 20 QWs (black) is multiplied by a factor of 5 to allow for a better comparison with the emitter with 100 QWs (purple). The peak field of both emitters scales linearly with the pump-pulse energy until saturation sets in at very high intensities

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