Efficiency of pulse pumped soliton microcombs

Author:

Li Jiang12,Bao Chengying13ORCID,Ji Qing-Xin1ORCID,Wang Heming1ORCID,Wu Lue1ORCID,Leifer Stephanie4,Beichman Charles4,Vahala Kerry1ORCID

Affiliation:

1. California Institute of Technology

2. hQphotonics Inc.

3. Tsinghua University

4. Jet Propulsion Laboratory

Abstract

Temporal soliton mode locking in coherently pumped microcavities is a promising route towards miniaturized frequency comb systems. However, the power efficiency of the resulting microcombs is usually quite low. Soliton generation by pulse pumping provides a way to increase conversion efficiency (so far, as high as 8%). Here, we study conversion efficiency and report a single-soliton conversion efficiency as high as 54% using a scanning laser, as well as a steady-state single-soliton conversion efficiency as high as 34%. We use the Lagrangian approach to develop analytical expressions for efficiency and soliton temporal placement within the pumping pulse, and our measurements reveal features in the tuning dependence of soliton power and efficiency not seen in continuous pumping. Our experimentally confirmed expressions for efficiency will be useful in understanding advantages and limitations of pulse pumped systems.

Funder

National Aeronautics and Space Administration

Air Force Office of Scientific Research

National Science Foundation

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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