Figure 1 | Scientific Reports

Figure 1

From: Intense, carrier frequency and bandwidth tunable quasi single-cycle pulses from an organic emitter covering the Terahertz frequency gap

Figure 1

Compact laser-driven Terahertz emitter with shaping capabilities over 7 octaves.

The wavelength-tunable output of an optical frequency mixer driven by a powerful Ti:sapphire laser is parametrically rectified in the nonlinear crystal HMQ-TMS, mounted on a glass substrate. Optical rectification gives rise to ultra-intense and ultra-broadband THz radiation which is separated from the pump pulse by a low-pass filter, LPF, at 20 THz (QMC instruments see Supplementary material for the transmission curve). The intense T-ray spectra are measured by means of a Michelson interferometer equipped with a Golay cell. The THz electric field evolution in time is reconstructed with air-biased coherent detector (ABCD). This technique is described in details in the supplementary material. The schematic of this diagnostics is shown in the inset. The THz beam and the probe pulse are both focused in between two high voltage electrodes and generate a second harmonic signal proportional the THz field. The AC bias voltage of amplitude ±2 kV and frequency 25 Hz is used for lockin detection.

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