用表面蚀刻相位屏产生大气状turbulence
Atmosphere-like turbulence generation with surface-etched phase-screens
摘要：
我们建立并表征了一个光学系统，该系统模拟了像甚大望远镜这样的8米级望远镜的光学特性。该系统包含旋转玻璃相位屏，以产生逼真的大气样的光学湍流，需要测试多共轭自适应光学系统。在本文中，我们提出了一个调查的统计特性的两个相位屏幕蚀刻在玻璃板表面，从Silios技术。这些蚀刻屏幕在0.45至2.5微米范围内具有高透射率（85%以上）。从直接成像来看，它们的Fried参数r0值（0.633微米处分别为0.43 ± 0.04 mm和0.81 ± 0.03 mm）与预期值在10%以内一致。这也证实了测量和预期泽尼克系数方差的比较。总的来说，我们发现这些屏幕是相当可重复的，允许亚毫米的r0值，这在过去是很难实现的。我们的结论是，望远镜仿真器和相位屏幕形成一个强大的大气湍流发生器，允许系统测试不同种类的AO仪器。
英文摘要：
We built and characterized an optical system that emulates the optical characteristics of an 8m-class telescope like the Very Large Telescope. The system contains rotating glass phase-screens to generate realistic atmosphere-like optical turbulence, as needed for testing multi-conjugate adaptive optics systems. In this paper we present an investigation of the statistical properties of two phase-screens etched on glass-plate surfaces, obtained from Silios Technologies. Those etched screens are highly transmissive (above 85%) from 0.45 to 2.5 microns. From direct imaging, their Fried parameter r0 values (0.43+-0.04 mm and 0.81+-0.03 mm, respectively, at 0.633 microns) agree with the expectation to within 10%. This is also confirmed by a comparison of measured and expected Zernike coefficient variances. Overall, we find that those screens are quite reproducible, allowing sub-millimetre r0 values, which were difficult to achieve in the past. We conclude that the telescope emulator and phase-screens form a powerful atmospheric turbulence generator allowing systematic testing of different kinds of AO instrumentation.
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