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Xu, Jia; Globisch, Björn; Hofer, Christina; Lilienfein, Nikolai; Butler, Thomas; Karpowicz, Nicholas; Pupeza, Ioachim (2018): Three-octave terahertz pulses from optical rectification of 20fs, 1 mu m, 78MHz pulses in GaP. In: Journal of Physics B-Atomic Molecular and Optical Physics, Vol. 51, No. 15, 154002
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We demonstrate optical rectification of 1 mu m pulses with a duration of 20 fs, a repetition-rate of 78 MHz and an average power of 5.5 W, in a 2 mm thick GaP crystal. The spectrum of the resulting far-infrared pulses is centered at 1.5 THz and extends to 5 THz at -50 dB intensity. In the absence of resonant absorption of GaP in this range, the spectrum has a well-behaved shape, facilitating spectroscopic applications. In the context of the recent rapid evolution of high-power Yb-based femtosecond laser systems, these results show a viable route towards sources of THz pulses combining broad bandwidth, high average power and a smooth spectral shape.