Open AccessPeriodically poled ridge waveguides in KTP for second harmonic generation in the UV regime
Author(s) -
Christof Eigner,
Matteo Santandrea,
Laura Padberg,
Martin Völk,
Christian E. Rüter,
Harald Herrmann,
Detlef Kip,
Christine Silberhorn
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.028827
Subject(s) - potassium titanyl phosphate , wafer dicing , optics , second harmonic generation , materials science , nonlinear optics , lithium niobate , optoelectronics , waveguide , ridge , quantum optics , physics , wafer , laser , paleontology , biology
Waveguide 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 4 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 μm and facilitated type-II second harmonic generation from 792 nm to 396 nm with high efficiency of 6.6 %/W·cm 2 . 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.