Multimode Amplification and Single-Mode Transformation Enabled by Thermal Modulation

doi:10.1002/lpor.202500251

2025-04-18

PRE

Qiwen Zhan (Qiwen Zhan)

Houkun Liang *

DOI：10.1002/lpor.202500251

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通过多模放大同时产生基模输出，以提高提取效率，代表了激光系统的理想范式。该方法在超快激光器中尤为有利，其中提高输出强度至关重要。在此发现，通常被认为对激光性能有害的热光效应，反而能促进模式转换，使多模放大器实现单模输出。具体而言，通过热调制，在基于Yb:CaAlGdO4介质的非稳态再生放大器中，输出功率提高了39%，达到50 W的基模输出和168 fs的脉冲宽度——为该系统建立了新的功率基准。此外，为验证其普适性，该技术被扩展应用于Yb:YAG增益介质，实现了43%的功率增强，并展示了有效的单模转换。所展示的方法可推广应用于多种激光增益介质以提升功率，且无需额外光学元件或设计复杂化。

Keyword:

femtosecond laser

multimode amplification

Yb:CaAlGdO4

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Laser and Photonics Reviews

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3.7K

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Nanyang Technological University

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4.9W

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sichuan university

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12.1W

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hangzhou yacto technology ltd., hangzhou, 311305 china

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university of shanghai for science and technology

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