THz generation
The THz spectral region is increasingly interesting for many applications. One way to generate THz radiation is to use near-infrared lasers and transform the radiation into the THz region. Thus, the most straight-forward approach for average power scaling of the THz radiation would be to increase the average power of the driving laser source.
Plasma-based approaches [1], photo-conductive antennas (PCA, [2]), as well as optical rectification (OR, [3]) and other processes based on nonlinear crystals [4, 5] can all benefit from high repetition rate driving lasers. AFS offers suitable systems based on Ytterbium or Thulium and the required nonlinear post-compression addons to enable efficient THz generation with unprecedented average power.
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[1] J. Buldt et al. "Fiber laser-driven gas plasma-based generation of THz radiation with 50-mW average power," Appl. Phys. B Lasers Opt. 126, 1–5 (2020).
[2] Y. C. Shen et al. "Generation and detection of ultrabroadband terahertz radiation using photoconductive emitters and receivers", Appl. Phys. Lett. 2, 164–166 (2004).
[3] F. Blanchard et al. "Generation of 1.5 µJ single-cycle terahertz pulses by optical rectification from a large aperture ZnTe crystal" Opt. Express 15(20), 13212–13220 (2007).
[4] F. Meyer et al. "Single-cycle, MHz repetition rate THz source with 66 mW of average power" Opt. Lett. 45, 2494-2497 (2020).
[5] S. Mansourzadeh et al. "High-Power Lensless THz Imaging of Hidden Objects" IEEE Access 9, 6268–6276 (2021).
