Efficiency of pulse pumped soliton microcombs
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.
Additional Information© 2022 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 14 September 2021; revised 28 January 2022; accepted 1 February 2022 (Doc. ID 443060); published 18 February 2022. We thank Anan Dai, Kemal Safak, and Franz X. Kärtner for building the BOC, as well as Andrei Vladimirov at Weierstrass Institute for discussions on modeling. Funding: National Aeronautics and Space Administration (80NM0018D0004); Air Force Office of Scientific Research (FA9550-18-1-0353); National Science Foundation (1908231). The authors declare no conflicts of interest. Data availability: Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.
Published - optica-9-2-231.pdf
Supplemental Material - 5677853.pdf