Bi-stability and period-doubling cascade of frequency combs in exceptional-point lasers.

Xingwei Gao, Hao He, Weng W Chow, Alexander Cerjan, Chia Wei Hsu

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Article in Nanophotonics (Berlin, Germany), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

5 authors.

Xingwei GaoMing Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, 90089, USA.ORCID https://orcid.org/0000-0001-8160-7426

Hao HeMing Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, 90089, USA.ORCID https://orcid.org/0000-0002-2121-2745

Weng W ChowCenter for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM, 87185, USA.

Alexander CerjanCenter for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM, 87185, USA.ORCID https://orcid.org/0000-0002-4362-7300

Chia Wei HsuMing Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, 90089, USA.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Recent studies have demonstrated that a laser can self-generate frequency combs when tuned near an exceptional point (EP), where two cavity modes coalesce. These EP combs induce periodic modulation of the population inversion in the gain medium, and their repetition rate is independent of the laser cavity's free spectral range. In this work, we perform a stability analysis that reveals two notable properties of EP combs, bi-stability and a period-doubling cascade. The period-doubling cascade enables halving of the repetition rate while maintaining the comb's total bandwidth, presenting opportunities for the design of highly compact frequency comb generators.

Indexed as

exceptional pointsfrequency combslasers

Identifiers

PMID40584419

DOI10.1515/nanoph-2025-0069

PMCPMC12199559

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