Advanced Photonics, 2019, 1 (6): 065001, Published Online: Dec. 30, 2019   

Mode-locked 2.8-μm fluoride fiber laser: from soliton to breathing pulse Download: 762次

Zhipeng Qin 1,2,3Guoqiang Xie 1,2,3,*Hongan Gu 1,2,3Ting Hai 1,2,3Peng Yuan 1,2,3Jingui Ma 1,2,3Liejia Qian 1,2,3,*
Author Affiliations
1 Shanghai Jiao Tong University, School of Physics and Astronomy, Shanghai, China
2 Shanghai Jiao Tong University, Collaborative Innovation Center of Inertial Fusion Sciences and Applications, Shanghai, China
3 Shanghai Jiao Tong University, Key Laboratory for Laser Plasmas, Ministry of Education, Shanghai, China
The mode-locked fluoride fiber laser (MLFFL) is an exciting platform for directly generating ultrashort pulses in the mid-infrared (mid-IR). However, owing to difficulty in managing the dispersion in fluoride fiber lasers, MLFFLs are restricted to the soliton regime, hindering pulse-energy scaling. We overcame the problem of dispersion management by utilizing the huge normal dispersion generated near the absorption edge of an infrared-bandgap semiconductor and promoted MLFFL from soliton to breathing-pulse mode-locking. In the breathing-pulse regime, the accumulated nonlinear phase shift can be significantly reduced in the cavity, and the pulse-energy-limitation effect is mitigated. The breathing-pulse MLFFL directly produced a pulse energy of 9.3 nJ and pulse duration of 215 fs, with a record peak power of 43.3 kW at 2.8 μm. Our work paves the way for the pulse-energy and peak-power scaling of mid-IR fluoride fiber lasers, enabling a wide range of applications.

Zhipeng Qin, Guoqiang Xie, Hongan Gu, Ting Hai, Peng Yuan, Jingui Ma, Liejia Qian. Mode-locked 2.8-μm fluoride fiber laser: from soliton to breathing pulse[J]. Advanced Photonics, 2019, 1(6): 065001.

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