Single Mode Lasing In Transversely Multi-Moded Pt-Symmetric Microring Resonators

Keywords

Guided waves; Laser resonators; Microring devices; PT-symmetry; Single-mode lasers

Abstract

Conventional techniques for transverse mode discrimination rely on introducing differential external losses to the different competing mode sets, enforcing single-mode operation at the expense of additional losses to the desirable mode. We show how a parity-time (PT) symmetric design approach can be employed to achieve single mode lasing in transversely multi-moded microring resonators. In this type of system, mode selectivity is attained by judiciously utilizing the exceptional point dynamics arising from a complex interplay of gain and loss. The proposed scheme is versatile, robust to deviations from PT symmetry such as caused by fabrication inaccuracies or pump inhomogeneities, and enables a stable operation considerably above threshold while maintaining spatial and spectral purity. The experimental results presented here were obtained in InP-based semiconductor microring arrangements and pave the way towards an entirely new class of chip-scale semiconductor lasers that harness gain/loss contrast as a primary mechanism of mode selectivity.

Publication Date

5-1-2016

Publication Title

Laser and Photonics Reviews

Volume

10

Issue

3

Number of Pages

494-499

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/lpor.201500292

Socpus ID

84968610661 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84968610661

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