What is it about?
In this work, we construct an anti-parity-time (anti-PT) symmetric Su-Schrieffer-Heeger (SSH) frequency lattice, by two ring resonators with antisymmetric amplitude (AM) modulations. We find that the temporal width of the pulse generated can be greatly shortened by the phase-mismatching of the AM modulations. Besides, the pulse shortening shows an extremely high sensitivity to the phase transition point, at which the anti-PT symmetry of the system is completely broken.
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Why is it important?
Our work exploits the concept of anti-PT symmetry in laser field to realize mode-locking (ML), and will have broad application prospects in ultrafast spectroscopy and utra-high sensitive sensor.
Perspectives
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This page is a summary of: Mode-locking in anti-PT symmetric frequency lattices, Applied Physics Letters, April 2023, American Institute of Physics,
DOI: 10.1063/5.0146246.
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