Figure 4 | Scientific Reports

Figure 4

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

Figure 4

Shaping of the Terahertz spectral output by tuning the pump laser central wavelength.

(a) Phase-matching conditions in HMQ-TMS give rise to a pronounced dependence of the THz spectrum as function of the pump laser wavelength which provides user control of the generated THz central frequency and the spectral width. The experimentally recorded multi-octave THz spectra cover the lower THz frequency range (800 nm pump) while the entire THz gap (0.1–15 THz) is subsequently covered for longer pump wavelength (1500 nm). The results are excellently reproduced in (b) by the corresponding theoretical modeling in the spectral range up to 12 THz (limited by the measured data on refractive index and absorption). Note that the spectra are plotted on a linear scale.

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