  Microcavity solitons enable miniaturized coherent frequency comb sources.
However, the formation of microcavity solitons can be disrupted by stimulated
Raman scattering (SRS), particularly in the emerging crystalline microcomb
materials with high Raman gain. Here, we propose and implement dissipation
control---tailoring the energy dissipation of selected cavity modes---to
purposely raise/lower the threshold of Raman lasing in a strongly Raman-active
lithium niobate microring resonator, and realize on-demand soliton mode-locking
or Raman lasing. Numerical simulations are carried out to confirm our analyses
and agree well with experiment results. Our work demonstrates an effective
approach to address strong SRS for microcavity soliton generation.
