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Timestamp: 2019-04-24 01:06:04+00:00

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We demonstrate terahertz (THz) generation at megahertz repetition rate by optical rectification in GaP crystals, using excitation average power levels exceeding 100 W. The laser source is a state-of-the-art diode-pumped Yb:YAG SESAM-mode-locked thin-disk laser, capable of generating 580 fs pulses at an average power up to 120 W and a repetition rate of 13.4 MHz directly from a one-box oscillator, without the need for any extra amplification stages. In this first demonstration, we measure a maximum THz average power of 78 μW at a central frequency of 0.8 THz. Our results show that optical rectification of state-of-the-art high average power ultrafast sources in nonlinear crystals is within reach and paves the way toward high average power, ultrafast laser pumped THz sources.
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Fig. 1. (a) Mode-locked thin-disk laser. HR: high-reflective mirror, CHR: concave high-reflective mirror. DM, dispersive mirror; TFP, thin-film polarizer; OC, output coupler. (b) Intensity autocorrelation. The inset shows the beam profile of the laser. (c) Power stability over 17 h measured with a slow detector at a typical operation power of 107.5 W.
Fig. 2. Experimental setup consisting of the 120 W driving laser and an EOS setup. A powermeter can be used to measure the THz power.
Fig. 3. (a) Electric field obtained by EOS for a 1 mm GaP crystal at an excitation power of 106 W for purged and unpurged cases. (b) Corresponding (normalized) power spectra, obtained by Fourier transformation. Calculated spectra are shown for comparison.
Fig. 4. Power curves as a function of pump power for different crystal thicknesses, obtained under ambient conditions.

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