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使用半色调点处理的带限日冕仪:II。任意口径望远镜的进展和实验结果

Band-Limited Coronagraphs using a halftone-dot process: II. Advances and laboratory results for arbitrary telescope apertures

P. Martinez, C. Dorrer, M. Kasper

摘要:

带限电晕放电是一个近乎理想的概念,理论上可以完美地消除轴上光源的所有光线。在过去的几年里,已经在实验室中开发和测试了几个原型,现在更多的重点是开发能够有效地提供这种概念的预期高对比度水平的最佳技术。继早期的近红外演示器的发展,我们提出并讨论了第二代原型使用半色调点技术的结果。我们报告改进的精度控制的本地传输的制造的原型,这是测量到小于1%。这种先进的H波段限带设备在实验室中表现出出色的对比度水平,在24%的光谱带宽上,在比3 lambda/D更远的角间距下,对比度水平可降至10-6。这些性能优于我们以前的原型超过一个数量级,并确认了制造工艺的成熟度。当前和下一代高对比度仪器可以直接受益于这种能力。在这种情况下,我们实验研究的能力,带限电晕放电,以承受各种复杂的望远镜孔径。

英文摘要:

The band-limited coronagraph is a nearly ideal concept that theoretically enables perfect cancellation of all the light of an on-axis source. Over the past years, several prototypes have been developed and tested in the laboratory, and more emphasis is now on developing optimal technologies that can efficiently deliver the expected high-contrast levels of such a concept. Following the development of an early near-IR demonstrator, we present and discuss the results of a second-generation prototype using halftone-dot technology. We report improvement in the accuracy of the control of the local transmission of the manufactured prototype, which was measured to be less than 1%. This advanced H-band band-limited device demonstrated excellent contrast levels in the laboratory, down to 10-6 at farther angular separations than 3 lambda/D over 24% spectral bandwidth. These performances outperform the ones of our former prototype by more than an order of magnitude and confirm the maturity of the manufacturing process. Current and next generation high-contrast instruments can directly benefit from such capabilities. In this context, we experimentally examine the ability of the band-limited coronagraph to withstand various complex telescope apertures.

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。

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