Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Development and Characterization of an Atmospheric Turbulence Simulator Using Two Rotating Phase Plates

  • Joo, Ji Yong (Department of Optical Engineering and Metal Mold, Kongju National University) ;
  • Han, Seok Gi (Department of Optical Engineering and Metal Mold, Kongju National University) ;
  • Lee, Jun Ho (Department of Optical Engineering and Metal Mold, Kongju National University) ;
  • Rhee, Hyug-Gyo (Optical imaging and metrology team, Advanced Instrumentation Institute, Korea Research Institute of Standards and Science) ;
  • Huh, Joon (Defense Industry Technology Center) ;
  • Lee, Kihun (Defense Industry Technology Center) ;
  • Park, Sang Yeong (Space Surveillance System TF Team, Hanwha Systems Co.)
  • Received : 2022.08.16
  • Accepted : 2022.09.15
  • Published : 2022.10.25
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Abstract

We developed an adaptive optics test bench using an optical simulator and two rotating phase plates that mimicked the atmospheric turbulence at Bohyunsan Observatory. The observatory was reported to have a Fried parameter with a mean value of 85 mm and standard deviation of 13 mm, often expressed as 85 ± 13 mm. First, we fabricated several phase plates to generate realistic atmospheric-like turbulence. Then, we selected a pair from among the fabricated phase plates to emulate the atmospheric turbulence at the site. The result was 83 ± 11 mm. To address dynamic behavior, we emulated the atmospheric disturbance produced by a wind flow of 8.3 m/s by controlling the rotational speed of the phase plates. Finally, we investigated how closely the atmospheric disturbance simulation emulated reality with an investigation of the measurements on the optical table. The verification confirmed that the simulator showed a Fried parameter of 87 ± 15 mm as designed, but a little slower wind velocity (7.5 ± 2.5 m/s) than expected. This was because of the nonlinear motion of the phase plates. In conclusion, we successfully mimicked the atmospheric disturbance of Bohyunsan Observatory with an error of less than 10% in terms of Fried parameter and wind velocity.

Keywords

Acknowledgement

Supported by the Defense Industry Technology Center through a research program entitled "high-speed optical wavefront deformable mirror system performance analysis technology development research (UC180003D)."

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