Turnkey Deterministic Soliton Crystal Generation

Abstract The deterministic generation of robust soliton combs is of great importance for the applications of optical frequency combs. As a novel form of microcomb, soliton crystals (SCs) have been shown to have advantages of easy generation, high conversion efficiency (CE), and thermal robustness. Here, the turnkey deterministic generation of a “palm‐like” SC is reported with a free‐running scheme. The robustness of turnkey SC generation is systematically examined in multiple aspects, including success rate, thermal robustness, and long‐term stability. The experimental results reveal that our turnkey SC generation achieves nearly 100 success rate and power variations within 1.5 dB over 100 trials of 2 samples. Additionally, this state shows minimal sensitivity to thermal drifts and remains robust under environmental changes during a 4‐hour laboratory test period.