Abstract-Milliwatt-class broadband THz source driven by a 112 W, sub-100 fs thin-disk laser

F. Meyer, N. Hekmat, T. Vogel, A. Omar, S. Mansourzadeh, F. Fobbe, M. Hoffmann, Y. Wang, and C. J. Saraceno

Fig. 1. Complete experimental setup consisting of the modelocked thin-disk laser (a), Herriott type MPC and dispersive mirrors (b), as well as THz generation and detection setup (c).

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-21-30340

We demonstrate a high repetition-rate, single-cycle THz source with a maximum average power of 1.35 mW, operating at a center frequency of 2 THz. This result was obtained by optical rectification (OR) in GaP using an amplifier-free, nonlinearly compressed modelocked thin-disk oscillator based on Yb:YAG, delivering 8.4 µJ pulses with 88 fs duration at a repetition rate of 13.4 MHz, resulting in driving pulses for OR with 112 W average power and 80 MW peak power. To the best of our knowledge, our result represents the highest average power so far achieved with OR in GaP. The demonstrated performance is very attractive for improving current linear THz time-domain spectroscopy experiments, which are currently restricted by low signal-to-noise ratio and long measurement times.

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