arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1208.3191astro-ph.IMastro-ph.EP
收藏

宽频带焦平面波前幅像差和相位像差的控制

Broadband Focal Plane Wavefront Control of Amplitude and Phase Aberrations

Tyler D. Groff, N. Jeremy Kasdin, Alexis Carlotti, A J Eldorado Riggs

摘要:

在普林斯顿高对比度成像实验室开发的行程最小化算法已经证明了在两个串联的可变形反射镜(DM)上使用最小行程的对称黑洞生成。行程最小化的窗口方法已经证明了在小带宽上的对称黑洞,通过使用三个波长来定义优化问题中的校正带宽。我们解决的振幅和相位像差与波长的关系,这是如何改变与多个DM,以及同时纠正两者,以实现对称的黑洞的影响。窗口配置中的操作冲程最小化需要多个波长估计。为了节省曝光,使用所建立的波长关系将单个估计外推到边界波长,以产生图像平面电场的多个估计。在这里,我们证明了更好的性能,通过改进这种外推的估计到其他波长。函数关系的准确性将最终限制可实现的带宽,因此作为度量,这些结果也与单独估计每个波长进行比较。除了这些算法的改进,我们还讨论了实验室升级,以及它如何更好地模拟宽带星光。我们还讨论了利用串联的两个DM直接估计窄带宽上的电场的可能性以及与之相关的挑战。

英文摘要:

The Stroke Minimization algorithm developed at the Princeton High Contrast Imaging Laboratory has proven symmetric dark hole generation using minimal stroke on two deformable mirrors (DM) in series. The windowed approach to Stroke Minimization has proven symmetric dark holes over small bandwidths by using three wavelengths to define the bandwidth of correction in the optimization problem. We address the relationship of amplitude and phase aberrations with wavelength, how this changes with multiple DMs, and the implications for simultaneously correcting both to achieve symmetric dark holes. Operating Stroke Minimization in the windowed configuration requires multiple wavelength estimates. To save on exposures, a single estimate is extrapolated to bounding wavelengths using the established relationship in wavelength to produce multiple estimates of the image plane electric field. Here we demonstrate better performance by improving this extrapolation of the estimate to other wavelengths. The accuracy of the functional relationship will ultimately bound the achievable bandwidth, therefore as a metric these results are also compared to estimating each wavelength separately. In addition to these algorithm improvements, we also discuss a laboratory upgrade and how it can better simulate broadband starlight. We also discuss the possibility of leveraging two DMs in series to directly estimate the electric field over a narrow bandwidth and the challenges associated with it.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑