High-average-power, intense THz pulses from a LiNbO3 slab with silicon output coupler

Tsarev, M. V.; Ehberger, D. und Baum, P. (2016): High-average-power, intense THz pulses from a LiNbO3 slab with silicon output coupler. In: Applied Physics B: Lasers and Optics, Bd. 122, Nr. 2, UNSP 30

Abstract

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 similar to 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 similar to 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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 1432-0649
• Sprache: Englisch