Bae Ji Eun, Mateos Xavier, Aguiló Magdalena, Díaz Francesc, Vázquez de Aldana Javier Rodríguez, Romero Carolina, Lee Hansuek, Rotermund Fabian
Opt Express. 2020 Jun 8;28(12):18027-18034. doi: 10.1364/OE.395701.
We report on the diverse pulsed operation regimes of a femtosecond-laser-written Yb:KLuW channel waveguide laser emitting near 1040 nm. By the precise position tuning of a carbon-nanotube-coated saturable absorber (SA) mirror, the transition of the pulsed operation from Q-switching, Q-switched mode-locking and finally sub-GHz continuous-wave mode-locking are obtained based on the interplay of dispersion and mode area control. The Q-switched pulses exhibit typical fast SA Q-switched pulse characteristics depending on absorbed pump powers. In the Q-switched mode-locking, amplitude modulations of the mode-locked pulses on the Q-switched envelope are observed. The radio-frequency spectrum represents the coexistence of Q-switching and mode-locking signals. In the purely mode-locked operation, the waveguide laser generates 2.05-ps pulses at 0.5 GHz.
我们报道了一种飞秒激光写入的、在1040 nm附近发射的Yb:KLuW通道波导激光器的多种脉冲工作模式。通过对碳纳米管包覆的可饱和吸收体（SA）镜进行精确的位置调谐，基于色散和模面积控制的相互作用，实现了从调Q、调Q锁模到最终亚千兆赫兹连续波锁模的脉冲操作转变。调Q脉冲根据吸收的泵浦功率表现出典型的快速SA调Q脉冲特性。在调Q锁模中，观察到锁模脉冲在调Q包络上的幅度调制。射频频谱显示了调Q和锁模信号的共存。在纯锁模操作中，波导激光器在0.5 GHz频率下产生2.05皮秒的脉冲。
