Periodically poled ridge waveguides in KTP for second harmonic generation in the UV regime
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-10-23 |
| Journal | Optics Express |
| Authors | Christof Eigner, Matteo Santandrea, Laura Padberg, Martin Vƶlk, Christian E. RĆ¼ter |
| Institutions | Helmut Schmidt University, Paderborn University |
| Citations | 19 |
Abstract
Section titled āAbstractāWaveguide circuits play a key role in modern integrated optics and provide an appealing approach to scalability in quantum optics. We report on periodically poled ridge waveguides in z-cut potassium titanyl phosphate (KTiOPO<sub>4</sub> or KTP), a material that has recently received growing interest due to its unique dispersion properties. Ridges were defined in surface-near rubidium-exchanged KTP by use of a precise diamond-blade dicing saw. We fabricated single-mode ridge waveguides at around 800 nm which exhibit widths of 1.9-3.2 Ī¼m and facilitated type-II second harmonic generation from 792 nm to 396 nm with high efficiency of 6.6 %/WĀ·cm<sup>2</sup>. Temperature dependence of the second harmonic process was found to be 53 pm/K. The low temperature dependence and high nonlinear conversion efficiency make our waveguides ideally suited for future operations in classical nonlinear integrated optics and integrated quantum networking applications.