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One solution to atmospheric blurring is to launch the telescope into space. There have been many successful telescopes launched into space that have returned invaluable information on our Sun and the universe we live in. Unfortunately, space missions are very expensive and impose strict size, weight, and maintenance requirements on their payloads.

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An Adaptive Optics system works by sensing optical disturbances in the incoming light with a device called a wavefront sensor and correcting those disturbances with a deformable mirror. A deformable mirror is a mirror made of a flexible material with many push-pull actuators connected to its back surface. By commanding the actuators to exert forces on the mirror’s surface, we can bend the deformable mirror to almost any arbitrary shape.

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Optical disturbances in light manifest themselves as differences in the distance that each light ray travels before it reaches our camera. Once our wavefront sensor has measured these path length differences, a computer control system calculates the mirror shape needed to correct them, and commands the deformable mirror to assume a shape that “undoes” the effects of the atmospheric blurring. Due to the constantly evolving nature of atmospheric turbulence, an Adaptive Optics system must execute hundreds or thousands of these measure-correct cycles per second.

Light travelling to us from space is distorted by small temperature variations in the Earth’s turbulent atmosphere. We see this when we look up at the stars. Large optical disturbances in starlight appear as high-frequency brightness variations, otherwise known as “twinkling”. While enjoyable to the eye, twinkling makes science very difficult because it turns small, detailed images into large, blurry blobs.

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While operational, the DKIST Adaptive Optics system monitors itself and automatically adjusts its own configuration to optimize its performance. Additionally, all its setup and calibration procedures are automated via Python scripts, making it much easier to operate than typical Adaptive Optics systems. This increased ease of operation will result in more observing time, maximizing the scientific value of the telescope.

Adaptive Optics is another solution to atmospheric blurring. An Adaptive Optics system corrects the optical disturbances that light encounters as it traverses Earth’s atmosphere, allowing a ground-based telescope to achieve the same resolution as a space telescope of the same size!

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The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 to promote the progress of science. NSF supports basic research and people to create knowledge that transforms the future. Please refer to www.nsf.gov.

Telescopes serve two primary purposes, improving our sensitivity and resolution. Sensitivity refers to how faint an object can be and still be detected. Resolution refers to how finely we can see the detail in an object we’re observing.

The National Solar Observatory (NSO) is the national center for ground-based solar physics in the United States (www.nso.edu) and is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation Division of Astronomical Sciences.

The DKIST Adaptive Optics system contains a Deformable Mirror with 1600 actuators and a wavefront sensor that samples the incoming wavefront in 1521 locations. Our control system uses Field-Programmable Gate Arrays to compute and correct optical disturbances in the image 2000 times per second. By providing a correction with such a high level of detail, the Adaptive Optics system will enable scientists to use the full power of the DKIST’s four-meter diameter primary mirror, resulting in the highest-resolution images of the sun ever seen!

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We can theoretically increase both the sensitivity and the resolution of our telescopes by increasing the size of their primary mirrors. However, due to blurring from Earth’s atmosphere, once a ground-based telescope’s primary mirror diameter is larger than a few inches, increasing its size no longer increases its resolution.