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Self-Seeding Induced Bidirectional Mode-Locking in Single-Cavity Dual-Comb Fiber Lasers
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DOI：10.1002/lpor.71665.png)
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Abstract
En 中文
Bidirectional single-cavity dual-comb fiber lasers represent a promising laser architecture for dual-comb metrology. However, establishing bidirectional mode-locking typically requires sophisticated fine-tuning with laser expertise owing to the strong gain competition between opposite directions, and the key mechanism for bidirectional mode-locking remains obscured. Consequently, the practical applications of such lasers are so far limited. In this work, the critical role of reflection-induced self-seeding in bidirectional mode-locking is discovered for the first time by the combination of real-time spectral characterization and numerical modeling. Enlightened by the intriguing discovery, a robust bidirectional mode-locking technique is invented, which instantaneously induces transitions from various unidirectional mode-locked states to a stable bidirectional mode-locked state in a turn-key manner. Lastly, the impact of key parameters in this technique is explored, providing a general application guideline. Our study not only provides fundamental insights into the bidirectional mode-locking mechanism in NPR-based fiber lasers, but also offers a practical scheme for achieving bidirectional mode-locking in such laser systems, which may promote their practical applications in various dual-comb metrologies.
Keywords:
bidirectional
dual comb
gain competition
self-seeding
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