Suppression and revival of single-cavity lasing induced by polarization-dependent loss

Yanxian Wei, Hailong Zhou, Dongmei Huang, Feng Li, Jianji Dong, Xinliang Zhang, P. K.A. Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


For most photonics devices and systems, loss is desperately averted, since it will increase the power consumption and degrade the performance. However, in some non-Hermitian systems, loss can induce a modal gain when the parity-time symmetry is broken, which offers a new way to manipulate the lasing of active cavities. Here we experimentally observe the counterintuitive phenomenon in a single laser cavity assisted by the polarization-dependent loss. A parity–time symmetric system is constituted by the two orthogonally polarized photonic loops in a single laser cavity, which can guarantee the consistency of two coupling loops. The measured output power of the cavity depends on the cross-polarization loss, which reveals virtually opposite relationships before and after the critical point. It provides a novel, to the best of our knowledge, understanding of polarization loss and shows great potential for lasing manipulation in a single cavity with polarization control.

Original languageEnglish
Pages (from-to)3151-3154
Number of pages4
JournalOptics Letters
Issue number13
Publication statusPublished - 1 Jul 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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