Mode-locking in anti-PT symmetric frequency lattices

Author:

Song Yiling1ORCID,Ke Shaolin2ORCID,Chen Yuelan1,Wang Mingfeng1ORCID

Affiliation:

1. Department of Physics, Wenzhou University 1 , Zhejiang 325035, China

2. Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology 2 , Wuhan 430205, China

Abstract

Active mode-locking (ML) is an important technique in laser science, which greatly shortens the laser pulse. Here, we construct an anti-parity-time (anti-PT) symmetric Su–Schrieffer–Heeger frequency lattice by two ring resonators with antisymmetric amplitude (AM) modulations. We find that the temporal width of the generated pulse can be greatly shortened by the phase-mismatching of the AM modulations. In addition, the pulse shortening shows extremely high sensitivity to the phase transition point, at which the anti-PT symmetry of the system is completely broken. This work exploits the concept of anti-PT symmetry in a laser field to realize ML, and will have broad application prospects in ultrafast spectroscopy and ultra-high sensitive sensors.

Funder

Natural Science Foundation of Zhejiang Province

Departmemt of Education of Zhejiang Province

Open Foundation Project of Hubei Provincal Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institude of Technology

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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