New deformable mirror technology and associated control strategies for ultrahigh intensity laser beam corrections and optimizations
New deformable mirror technology and associated control strategies for ultrahigh intensity laser beam corrections and optimizations
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用于超高强度激光束校正和优化的新型可变形镜技术和相关控制策略
DOI：
10.1117/12.907180
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Lionnel Escolano
中科院分区：
文献类型：
--
作者：
N. Lefaudeux;X. Levecq;G. Dovillaire;S. Theis;Lionnel Escolano
当超高强度激光设备处于早期开发阶段时，唯一的问题是获得具有正确能量和脉冲持续时间的激光脉冲。由于设施面向最终用户，现在需要提供具有附加质量的激光束，例如具有恒定质量的焦斑。这就是为什么自适应光学现在是当前超高强度激光设施的标准功能，以校正离开激光链的光束的像差。然而，最后的光学部件，如用于聚焦光束的离轴抛物线，引起不能直接校正的像差，因为它们位于波前感测之后。提出了一种新的变形镜技术和一种新的校正策略，以获得实验室中的最佳焦斑，并测量了光束在实验室中的实际质量。这些可变形反射镜的设计考虑到了超强激光应用的需求。它们提供卓越的稳定性、光学质量和创新功能，如反射表面的可扩展性和维护。提出的校正方法使用通常的自适应光学回路来校正来自激光链的所有像差，以及额外的步骤来获得非放大光束在实验室中的最佳焦斑，并在放大光束用于实验时校正和测量实际光束质量。
When ultra high intensity lasers facilities were in their early development, the only concern was getting laser pulses with the right energy and pulse duration. As facilities are orienting toward the end users, they are now required to deliver a laser beam with additional qualities like a focal spot with constant quality. That is why Adaptive Optics is now a standard feature for the current ultra high intensity lasers facilities to correct for the aberrations of the beam exiting the laser chain. However, the very last optical components, like the off axis parabola to focus the beam induce aberrations that cannot be directly corrected as they are located after the wavefront sensing. We present a new technology of deformable mirror and a new correction strategy to get optimal focal spot in the experiment chamber as well as measurement of the actual beam quality in the chamber while the beam is used for experiments. These deformable mirrors were designed taking into account needs of ultra intense laser applications. They provide exceptional stability, optical quality and innovative features like scalability and maintenance of the reflective surface. The method of correction proposed uses usual adaptive optics loop to correct for all the aberration from the laser chain, as well as additional steps to get an optimal focal spot in the experiment chamber on a non amplified beam, and to correct and measure the actual beam quality on the amplified beam while it is used for experiments.