Polygon Coherent Modes in a Weakly Perturbed Whispering Gallery Microresonator for Efficient Second Harmonic, Optomechanical, and Frequency Comb Generations

Zhiwei Fang, Sanaul Haque, Saeed Farajollahi, Haipeng Luo, Jintian Lin, Rongbo Wu, Jianhao Zhang, Zhe Wang, Min Wang, Ya Cheng, and Tao Lu
Phys. Rev. Lett. 125, 173901 – Published 20 October 2020
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Abstract

We observe high optical quality factor (Q) polygonal and star coherent optical modes in a lithium niobate microdisk. In contrast to the previous polygon modes achieved by deformed microcavities at lower mechanical and optical Q, we adopt weak perturbation from a tapered fiber for the polygon mode formation. The resulting high intracavity optical power of the polygon modes triggers second harmonic generation at high efficiency. With the combined advantages of a high mechanical Q cavity, we observe optomechanical oscillation in polygon modes for the first time. Finally, we observe frequency microcomb generation from the polygon modes with an ultrastable taper-on-disk coupling mechanism.

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  • Received 6 June 2020
  • Accepted 11 September 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.173901

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Zhiwei Fang1,2,*, Sanaul Haque3,*, Saeed Farajollahi3, Haipeng Luo3, Jintian Lin4, Rongbo Wu4, Jianhao Zhang4, Zhe Wang4, Min Wang1,2, Ya Cheng1,2,4,5,†, and Tao Lu3,‡

  • 1State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • 2XXL—The Extreme Optoelectromechanics Laboratory, School of Physics and Electronics Science, East China Normal University, Shanghai 200241, China
  • 3Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
  • 4State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 5Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Shanxi, China

  • *These authors contributed equally to this work.
  • ya.cheng@siom.ac.cn
  • taolu@ece.uvic.ca

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Issue

Vol. 125, Iss. 17 — 23 October 2020

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