The phenomenon of thermal focus shift in optical systems, mainly caused by thermal lensing, is well known. There are numerous publications dealing with this effect, but they do not answer the quest...

中文翻译：

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热致焦点偏移对激光切割边缘质量的影响

光学系统中主要由热透镜效应引起的热焦点偏移现象是众所周知的。有许多出版物处理这种效果，但它们没有回答这个问题......