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Subharmonic entrainment breather solitons in ultrafast lasers
Physical Review Letters ( IF 8.385 ) Pub Date : 
Tianhao Xian; Li Zhan; Wenchao Wang; Wenyan Zhang

We study theoretically and experimentally the subharmonic entrainment (SHE) breather soliton in mode-locked lasers for the first time; the breather period is an integer ratio to the roundtrip time. We build up a non-Hermitian-degeneracy map of breather soliton, and illustrate that the SHE arises between the two exceptional points (EPs). We obtain SHE at the ratio of 20, observe the evolution of breather soliton when tuning the gain and/or cavity loss, and prove that this phenomenon can improve the stability of breather soliton. Our research has brought insights to the EP physics of ultrafast lasers, making the mode-locked laser a powerful test bed for non-Hermitian-degeneracy, which may spur a new course of ultrafast laser researches.
更新日期:2020-09-14

 

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