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 resulting microcombs usually quite low. Soliton generation by pulse pumping provides way to increase conversion (so far, as high 8%). Here, we study and report single-soliton 54% using scanning laser, well steady-state 34%. We use Lagrangian approach develop analytical expressions for temporal placement within pulse, our measurements reveal features tuning dependence not seen continuous pumping. Our experimentally confirmed will be useful understanding advantages limitations