Abstract-µJ-level multi-cycle terahertz generation in a periodically poled Rb:KTP crystal

 

Wenlong Tian, Giovanni Cirmi, Halil T. Olgun, Patrick Mutter, Carlota Canalias, Andrius Zukauskas, Lu Wang, Elias Kueny, Frederike Ahr, Anne-Laure Calendron, Fabian Reichert, Kore Hasse, Yi Hua, Damian N. Schimpf, Hüseyin Çankaya, Mikhail Pergament, Michael Hemmer, Nicholas Matlis, Valdas Pasiskevicius, Fredrik Laurell, Franz X. Kärtner

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-46-4-741

We demonstrate multi-cycle terahertz (MC-THz) generation in a 15.5 mm long periodically poled rubidium (Rb)-doped potassium titanyl phosphate (Rb:PPKTP) crystal with a poling period of 300 µm. By cryogenically cooling the crystal to 77 K, up to 0.72 µJ terahertz energy is obtained at a frequency of 0.5 THz with a 3 GHz bandwidth. A maximum internal optical-to-terahertz conversion efficiency of 0.16% is achieved, which is comparable with results achieved using periodically poled lithium niobate crystal. Neither photorefractive effects nor damage was observed with up to 900mJ/cm2$900{\mathrm{m}\mathrm{J}/\mathrm{c}\mathrm{m}}^2$, showing the great potential of Rb:PPKTP for multi-millijoule-level MC-THz generation.

© 2021 Optical Society of America