Abstract
Crystalline optical whispering gallery mode resonators made from alkaline earth fluorides can achieve exceptionally large optical finesse, and are used in a variety of applications, from frequency stabilization and narrow linewidth lasers, to low-noise microwave generation or soliton Kerr frequency combs. Here we demonstrate an efficient coupling method to resonators of these materials, which employs photonic integrated waveguides on a chip based on silicon nitride. By converting a mode from silicon nitride to a free-hanging silica waveguide on a silicon chip, coupling to a crystalline resonator is achieved with a high extinction, while preserving a quality factor exceeding 200 million. This compact, heterogeneous integration of ultra-high -factor crystalline resonators with photonic waveguides provides a proof of concept for wafer scale integration and robust, compact packaging for a wide range of applications.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Junqiu Liu, Arslan S. Raja, Martin H. P. Pfeiffer, Clemens Herkommer, Hairun Guo, Michael Zervas, Michael Geiselmann, and Tobias J. Kippenberg
Opt. Lett. 43(14) 3200-3203 (2018)
Guangyao Liu, Vladimir S. Ilchenko, Tiehui Su, Yi-Chun Ling, Shaoqi Feng, Kuanping Shang, Yu Zhang, Wei Liang, Anatoliy A. Savchenkov, Andrey B. Matsko, Lute Maleki, and S. J. Ben Yoo
Optica 5(2) 219-226 (2018)
Philippe Jean, Alexandre Douaud, Vincent Michaud-Belleau, Sandra Helena Messaddeq, Jérôme Genest, Sophie LaRochelle, Younès Messaddeq, and Wei Shi
Opt. Lett. 45(10) 2830-2833 (2020)