{"title":"Modal dispersion in a cylindrical WGM microcavity caused by modal energy dissipation","authors":"Arkady Novikov , Hiba Rizk , Dmitry Kudashkin , Victor Simonov , Alena Kolesnikova , Ilya Vatnik","doi":"10.1016/j.optcom.2025.131641","DOIUrl":null,"url":null,"abstract":"<div><div>Dissipation of the energy stored in the modes of a cylindrical microcavity with minor radius variations perturbs the temperature of the resonator, significantly affecting the mode structure. We experimentally demonstrate that thermal drifts not only shift the mode spectrum as a whole but also alter the free spectral range between adjacent axial modes and give rise to new eigenmodes. Through a numerical model, we show that in microresonators suitable for low-frequency comb generation, the thermally induced dispersion can be comparable to the mode linewidth. Fortunately, the positive sign of the dispersion does not hinder the modulation instability required for nonlinear generation.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131641"},"PeriodicalIF":2.2000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics Communications","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0030401825001695","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Dissipation of the energy stored in the modes of a cylindrical microcavity with minor radius variations perturbs the temperature of the resonator, significantly affecting the mode structure. We experimentally demonstrate that thermal drifts not only shift the mode spectrum as a whole but also alter the free spectral range between adjacent axial modes and give rise to new eigenmodes. Through a numerical model, we show that in microresonators suitable for low-frequency comb generation, the thermally induced dispersion can be comparable to the mode linewidth. Fortunately, the positive sign of the dispersion does not hinder the modulation instability required for nonlinear generation.
期刊介绍：
Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.
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