High-average-power, intense THz pulses from a LiNbO3 slab with silicon output coupler
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Many applications of THz radiation require high fields and high repetition rates at the same time, implying substantial average power levels. Here, we report high-power Cherenkov-type THz generation in a LiNbO3 slab covered with a silicon prism outcoupler, a geometry in which the ratio between heat-removing surfaces and pump volume is naturally maximized for facilitating heat removal. At a conversion efficiency of 0.04 %, we achieve ~100 times more output power than before with such geometry. Although about 10 % of the 15 W pump power is converted to heat via multi-photon absorption effects, the peak crystal temperature increases by only 8 K. This result is due to the focus’ extreme aspect ratio of ~100, indicating the scalability of the approach to even higher average power levels. A line-shaped focus should be advantageous for removing heat in other optical conversions as well.
We acknowledge funding from the European Research Council and the Munich-Centre of Advanced Photonics. M.V.T. acknowledges support under the agreement 02.B.49.21.0003 between Ministry of Science and Education of Russia and University of Nizhny Novgorod and by RFBR Grant 15-02-08328.
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