Subharmonic Entrainment Breather Solitons in Ultrafast Lasers

Subharmonic Entrainment Breather Solitons in Ultrafast Lasers

We study theoretically and experimentally the subharmonic entrainment (SHE) breather soliton in mode-locked lasers for the first time, in which the ratio of the breather period to the round-trip time is an integer. We build a non-Hermitian degeneracy map of breather soliton, and illustrate that SHE...

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Veröffentlicht in:Physical review letters 2020-10, Vol.125 (16), p.163901-163901, Article 163901
Hauptverfasser: Xian, Tianhao, Zhan, Li, Wang, Wenchao, Zhang, Wenyan
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Sprache:eng
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Entrainment
Laser mode locking
Lasers
Solitary waves
Ultrafast lasers
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Zhan, Li
Wang, Wenchao
Zhang, Wenyan
description We study theoretically and experimentally the subharmonic entrainment (SHE) breather soliton in mode-locked lasers for the first time, in which the ratio of the breather period to the round-trip time is an integer. We build a non-Hermitian degeneracy map of breather soliton, and illustrate that 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 brings insight into the EP physics of ultrafast lasers and makes the mode-locked laser a powerful test bed for non-Hermitian degeneracy, which may open a new course in ultrafast laser research.
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source American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Entrainment
Laser mode locking
Lasers
Solitary waves
Ultrafast lasers
title Subharmonic Entrainment Breather Solitons in Ultrafast Lasers
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