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The perfect soliton crystal (PSC) was recently discovered as an extraordinaryKerr soliton state with regularly distributed soliton pulses and enhanced combline power spaced by multiples of the cavity free spectral ranges (FSRs). Themodulation of continuous-wave excitation in optical microresonators and thetunable repetition rate characteristic will significantly enhance and extendthe application potential of soliton microcombs for self-referencing combsource, terahertz wave generation, and arbitrary waveform generation. However,the reported PSC spectrum is generally narrow. Here, we demonstrate thedeterministic accessing of versatile perfect soliton crystals in the AlNmicroresonators (FSR ~374 GHz), featuring a broad spectral range up to 0.96 ofan octave-span (1170-2300 nm) and terahertz repetition rates (up to ~1.87 THz).The measured 60-fs short pulses and low-noise characteristics confirms the highcoherence of the PSCs

Near octave-spanning perfect soliton crystals in AlN microresonators