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Optical frequency combs in microresonators (microcombs) have a wide range ofapplications in science and technology, due to its compact size and access toconsiderably larger comb spacing. Despite recent successes, the problems ofself-starting, high mode efficiency as well as high output power have not beenfully addressed for conventional soliton microcombs. Recent demonstration oflaser cavity soliton microcombs by nesting a microresonator into a fibercavity, shows great potential to solve the problems. Here we comprehensivelystudy the dissipative soliton generation and interaction dynamics in amicroresonator-filtered fiber laser in both theory and experiment. We firstbring theoretical insight into the mode-locking principle, discuss theparameters effect on soliton properties and provide experimental guidelines forbroadband soliton generation. We predict chirped bright dissipative solitonwith flat-top spectral envelope in microresonators with normal dispersion,which is fundamentally infeasible for externally driven case. Furthermore, weexperimentally achieve soliton microcombs with large bandwidth of ~10 nm andhigh mode efficiency of 90.7%. Finally, by taking advantage of anultrahigh-speed time magnifier, we study the real-time soliton formation andinteraction dynamics and experimentally observe soliton Newton's cradle. Ourstudy will benefit the design of the novel, high-efficiency and self-startingmicrocombs for real-world applications.

Dissipative soliton generation and real-time dynamics in microresonator-filtered fiber lasers