He Wenbin, Pang Meng, Russell Philip St J
Russell Centre for Advanced Lightwave Science, Shanghai Institute of Optics and Fine Mechanics and Hangzhou Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics CAS, Shanghai, 201800, China.
Light Sci Appl. 2025 Jan 2;14(1):20. doi: 10.1038/s41377-024-01682-0.
Continuous-wave mode-locking at multi-GHz repetition rates is achieved in an ultrashort laser cavity at critical pulse energies 100 times lower than predicted by conventional theory. The authors reveal that dynamic gain depletion and recovery between consecutive round-trips is the key factor behind a low-pulse-energy transition from Q-switched mode-locking (QSML) to continuous-wave mode-locking (CWML). As well as providing new insight into gain dynamics, the results suggest a practical route to low-threshold lasing at very high-repetition rates.
在一个超短激光腔中，以多吉赫兹重复频率实现了连续波锁模，其临界脉冲能量比传统理论预测的低100倍。作者揭示，连续往返之间的动态增益耗尽和恢复是从调Q锁模（QSML）到连续波锁模（CWML）的低脉冲能量转变背后的关键因素。这些结果不仅为增益动力学提供了新的见解，还为在非常高的重复频率下实现低阈值激光发射指明了一条切实可行的途径。
