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摘要:
为了解决光束与法布里珀罗腔的入腔失调问题,本文基于谐振模式能量梯度上升自适应调整双反射镜步进,实现所需谐振模式的入腔光束指向。首先,利用双反射镜步进与入腔光束失调的关系,提出分离式入腔光束平移与角度调整方法。其次,利用EfficientNET神经网络对谐振模式图片进行分类,实现不同激光模式的图像识别。最后,利用腔后模式能量梯度调整双反射镜步进,低成本、高效率实现目标谐振模式的入腔耦合。本文的入腔光束指向调整方法为超稳激光器以及引力波探测中法布里珀罗腔的入腔耦合提供了新思路。
Abstract:Addressing the issue of beam alignment with Fabry-Pérot cavities, this paper proposes an adaptive dual-mirror step adjustment method based on the gradient ascent of transmitted resonant mode energy to achieve cavity coupling. First, leveraging the relationship between the reflection angles of the dual mirrors and the beam pointing, independent adjustment of the incident beam position and angle was proposed. Second, the EfficientNet neural network was used to classify resonant mode images, enabling identification of different mode images. Third, the energy gradient of the cavity mode was utilized for adaptively dual mirrors step adjustment, enabling low-cost and efficient cavity coupling of both fundamental and higher-order modes. The beam pointing adjustment method proposed will offer a novel solution for coupling lasers with Fabry-Pérot cavities in ultra-stable lasers and gravitational wave detection.
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Key words:
- cavity coupling /
- beam pointing /
- Fabry-Pérot cavities /
- dual steering mirrors /
- gradient ascent
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