Technology of vacuum channel stress compensation for laser beam propagation
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摘要: 介绍了真空通道应力补偿结构的基本工作原理；研究了大温差环境下，激光束长距离真空传输通道的真空负压应力和热胀冷缩应力的自适应补偿技术和光学舱结构变形抑制技术；在整个光学系统上，开展了现场安装调试和真空负压应力考核，并进行环境温差变化情况下的光路传输稳定性试验验证。试验结果表明：解决了超长激光束真空传输通道在真空负压和大温差环境下的真空负压应力和热胀冷缩应力的自适应补偿问题和光学舱结构变形抑制问题；实现了传输通道真空负压应力自动平衡；消除了真空负压应力造成的光束漂移；实现了大温差环境下的真空负压通道结构热胀冷缩应力的自由释放；达到了光路长时间保持稳定的实际效果。Abstract: The basic working principle of the vacuum channel stress compensation structure is introduced. The adaptive compensation technology and the optical cabin structure deformation suppression technology subjected to the vacuum negative pressure stress, thermal expansion and cold contraction stresses of the laser beam long-distance vacuum transmission channel in large temperature difference environments are investigated. The installation, debugging and evaluation of the vacuum channel stress compensation structure are carried out with the whole optical system, and the optical transmission stability is verified by some experiments with ambient temperature difference. The experimental results show that the problem of adaptive compensation for vacuum negative pressure stress and thermal expansion and cold contraction stress in the ultra-long laser beam vacuum transmission channel under vacuum negative pressure and large temperature difference environments, and the problem of deformation suppression of the optical cabin structure are solved. The automatic balance of vacuum negative pressure stress in the transmission channel is achieved, and the laser beam drift caused by vacuum negative pressure stress is eliminated. The release of thermal expansion and cold contraction stresses in the vacuum negative pressure channel structure under large temperature difference environments is achieved, the actual effect of maintaining stability of the optical path for a long time is achieved.
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图 5 无负压应力真空光学舱分析结果
Figure 5. Numerical analysis results of vacuum optical cabin without negative pressure
图 10 真空负压应力自动平衡应用
Figure 10. Principle of vacuum negative pressure stress automatic balance
图 11 热胀冷缩应力补偿原理
Figure 11. Stress compensation principle of thermal expansion and cold contraction
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