710 kW stable average power in a 45,000 finesse two-mirror optical cavity

Very high-average optical enhancement cavities (OECs) are being used both in fundamental and applied research. The most demanding applications require stable megawatt level average power of infrared picosecond pulses with repetition rates of several tens of MHz. Toward reaching this goal, we report on the achievement of 710 kW of stable average power in a two-mirror hemispherical optical enhancement cavity. This result further improves the state of the art. So far, in compact high-power systems, cavity geometry optimization has been driven by the need to limit the deformation of radii of curvatures due to thermal effects. Here we explicitly demonstrate that thermal lensing must be accounted for, too, and that it can be used to assess the absorption of coatings. Experimental observations are matched with a simple model of thermal effects in the mirror's coatings. These results set a further stage for designing an optimized optical system for several applications where very high-average power enhancement cavities are expected to be operated.

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Publication Details

Journal
Optics Letters
Published
2024-11-11
DOI
https://doi.org/10.1364/ol.543388
Citations
11
Primary Topic
Laser-Matter Interactions and Applications
Type
article
Field-Weighted Citation Impact
3.71

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article

710 kW stable average power in a 45,000 finesse two-mirror optical cavity

R. Chiche, Lixin Yan, Wenhui Huang, Chuanxiang Tang et al.
11 citations
Optics Letters
Laser-Matter Interactions and Applications
3.71
article

710 kW stable average power in a 45,000 finesse two-mirror optical cavity

R. Chiche, Lixin Yan, Wenhui Huang, Chuanxiang Tang, V. Soskov, Xinyi Lu, A. Martens, Kévin Dupraz, D. Nutarelli, C. Michel, Laurent Pinard, Xing Liu, F. Zomer, Jérôme Lhermite
article en
11 citations

Abstract

Very high-average optical enhancement cavities (OECs) are being used both in fundamental and applied research. The most demanding applications require stable megawatt level average power of infrared picosecond pulses with repetition rates of several tens of MHz. Toward reaching this goal, we report on the achievement of 710 kW of stable average power in a two-mirror hemispherical optical enhancement cavity. This result further improves the state of the art. So far, in compact high-power systems, cavity geometry optimization has been driven by the need to limit the deformation of radii of curvatures due to thermal effects. Here we explicitly demonstrate that thermal lensing must be accounted for, too, and that it can be used to assess the absorption of coatings. Experimental observations are matched with a simple model of thermal effects in the mirror's coatings. These results set a further stage for designing an optimized optical system for several applications where very high-average power enhancement cavities are expected to be operated.

Optics LettersVol. 49(23)
Université Claude Bernard Lyon 1 (FR), Centre National de la Recherche Scientifique (FR), Université de Bordeaux (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Centre Lasers Intenses et Applications (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Tsinghua University (CN)
Agence Nationale de la Recherche, National Key Research and Development Program of China
Affordable and clean energy
Openalex Percentile: Top 6%
Laser-Matter Interactions and Applications
3.71
DOISourceOpenAlex
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