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Development of an atmospheric turbulence simulator for deformable mirror evaluation

机译：开发用于可变形镜面评估的大气湍流模拟器

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Currently we are developing a 10 cm silicon carbide (SiC) deformable mirror with 37 actuators operating at 500 Hz. The deformable mirror will be applied in a 1.5 m telescope. An adaptive optics system capability for the deformable mirror was simulated and performance was predicted based on the Kolmogorov atmospheric turbulence model. However, in order to confirm the predictions, a closed-loop adaptive optics system was constructed with the insertion of an atmospheric turbulence simulator consisting of two point sources, a Boston deformable mirror, and double random phase plates. In order to simulate a binary star, the two point sources are mounted on 3-axis micron meter stages and are optically merged into a single beam path by a beam splitter cube. The light intensity of each source is adjustable to a corresponding stellar magnitude, while the angular separation can be precisely adjusted by moving the 3-axis stages. The atmospheric disturbance is generated by shaping the Boston deformable mirror and also by rotating the double phase plates. The Fried parameter of the generated the atmospheric disturbance corresponds to an area from 7 to 15 cm at 500 nm at the telescope pupil plane, which represents typical seeing conditions at the Bohyun observatory, South Korea.
机译：目前，我们正在开发10厘米碳化硅（SiC）可变形反射镜，该反射镜具有37个以500 Hz工作的致动器。变形镜将应用于1.5 m望远镜。模拟了可变形反射镜的自适应光学系统功能，并基于Kolmogorov大气湍流模型预测了性能。但是，为了确认预测结果，构建了一个闭环自适应光学系统，其中插入了一个大气湍流模拟器，该模拟器由两个点源，一个波士顿可变形镜和两个随机相位板组成。为了模拟双星，将两点源安装在3轴微米级载物台上，并通过分束器立方体光学合并到单个光束路径中。每个光源的光强度可调节到相应的恒星大小，而角间隔可通过移动3轴位移台来精确调节。大气干扰是通过使波士顿可变形镜成形以及旋转双相板而产生的。所产生的大气干扰的弗里德参数对应于望远镜光瞳平面处500 nm处7至15 cm的区域，该区域代表韩国Bohyun天文台的典型观测条件。

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