论文标题
部分可观测时空混沌系统的无模型预测
Ultrafast laser stress figuring for accurate deformation of thin mirrors
论文作者
论文摘要
制造自由形式镜子依赖于能够任意修改低空间频率高的精确光学图形过程而不会产生高空间频率错误。我们提出了一个可扩展的过程，可以使用专注的超快激光器产生的应力准确地描绘薄镜。在2-3次迭代中，我们将超快激光应力（ULSF）应用于四个薄熔融二氧化硅镜子，以将它们校正至10-20 nm rms，并在2-3次迭代中校正，而不会显着影响更高频率的错误。我们在一个月内测量了镜子，发现介电涂层的镜子稳定，但铝制镜面的稳定性尚无定论。 ULSF的准确性和吞吐量与现有的确定性数字过程相提并论，但是ULSF在镜像涂层后可以应用于中间空间频率误差，并且可以使用成熟的激光处理技术来扩展到更高的吞吐量。 ULSF为快速，准确地塑造自由形式镜子提供了新的潜力。
Fabricating freeform mirrors relies on accurate optical figuring processes capable of arbitrarily modifying low-spatial frequency height without creating higher-spatial frequency errors. We present a scalable process to accurately figure thin mirrors using stress generated by a focused ultrafast laser. We applied ultrafast laser stress figuring (ULSF) to four thin fused silica mirrors to correct them to 10-20 nm RMS over 28 Zernike terms, in 2-3 iterations, without significantly affecting higher-frequency errors. We measured the mirrors over a month and found that dielectric-coated mirrors were stable but stability of aluminum-coated mirrors was inconclusive. The accuracy and throughput for ULSF is on par with existing deterministic figuring processes, yet ULSF doesn't significantly affect mid-spatial frequency errors, can be applied after mirror coating, and can scale to higher throughput using mature laser processing technologies. ULSF offers new potential to rapidly and accurately shape freeform mirrors.
