적응광학계용 37채널 SiC 변형거울을 이용한 파면 보상
Wavefront Compensation Using a Silicon Carbide Deformable Mirror with 37 Actuators for Adaptive Optics
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
본 논문에서는 37채널을 갖는 적응광학계용 SiC(Silicon Carbide) 변형거울의 파면 보상 성능 검증에 관한 내용을 다룬다. 컴퓨터 시뮬레이션을 통해 SiC 변형거울의 파면 보상 성능을 예측하였고, 실제 closed-loop 적응광학계를 구성하여 파면 보상 성능을 확인 하였다. Closed-loop 적응광학계는 광원, 위상판, SiC 변형거울, 고속 샥-하트만 센서 그리고 제어용 컴퓨터로 구성되어있다. 회전하는 위상판에 의해 왜곡된 파면을 샥-하트만 센서로 측정하고, SiC 변형거울을 이용하여 왜곡된 파면을 보상해주는 시스템이다. 결과적으로 closed-loop 적응광학계에서 500 Hz의 속도로 PV(Peak-to-Valley) 0.3 µm ~ 0.9 µm, RMS(Root-Mean-Square) 0.06 µm ~ 0.25 µm의 왜곡된 파면을 PV 0.1 µm, RMS 0.03 µm이하로 보상시킬 수 있었다.
Abstract
In this paper, we deal with the wavefront compensation capability of a silicon carbide (SiC) deformable mirror (DM) with 37 actuators for adaptive optics. The wavefront compensation capability of the SiC DM is predicted by computer simulation and examined by actual experiments with a closed-loop adaptive optics system consistsing of a light source, a phase plate, a SiC DM, a high speed Shack-Hartmann sensor, and a control computer. Distortion of wavefront is caused by the phase plate in the closed-loop adaptive optics system. The distorted wavefront has a peak-to-valley (PV) wavefront error of 0.3 µm ~ 0.9 µm and root-mean-square (RMS) error of 0.06 µm ~ 0.25 µm. The high-speed Shack-Hartmann sensor measures the wavefront error of the distortion caused by the phase plate, and the SiC DM compensates for the distorted wavefront. The compensated wavefront has residual errors lower than 0.1 µm PV and 0.03 µm RMS. Consequently, we conclude that we can compensate for the distorted wavefront using the SiC DM in the closed-loop adaptive optics system with an operating frequency speed of 500 Hz.
참고문헌 (14)
- J. W. Hardy, "Adaptive optics for astronomical telescopes" (1998), Oxford University Press
- R. A. Muller, "Real-time correction of atmospherically degraded telescope images through image sharpening", J. Opt. Soc. Am, 64, pp.1200~1210 (1974)
- Y. S. Seo, "Closed-loop adaptive optics system for wave-front correction", Journal of Korean Physical Society, 39, pp.891~894 (2001)
- E. J. Fernandez, "Closed-loop adaptive optics in the human eye", Opt. Lett, 26, pp.746~748 (2001)
- 이준호, "A 37Ch Visible Adaptive Optics System for Wavefront Compensation", Journal of the Korean Physical Society, 49(1), pp.139~144 (2006), 한국물리학회
- 안교훈, "Silicon Carbide Deformable Mirror with 37 Actuators for Adaptive Optics", Journal of the Korean Physical Society, 67(10), pp.1882~1888 (2015), 한국물리학회
- C. Higgs, "Atmoshperic compensation and tracking using active illumination", Lincoln Laboratory Journal, 11, pp.5~26 (1998)
- B. C. Platt, "History and principles of Shack-Hartmann wavefront sensing", Journal of Refractive Surgery, 17, pp.573~577 (2001)
- R. Rampy, "Production of phase screens for simulation of atmospheric turbulence", Appl. Opt, 51, pp.8769~8778 (2012)
- E. Dalimeir, "Comparative analysis of deformable mirrors for ocular adaptive optics", Opt. Express, 13, pp.4275~4285 (2005)
- W. H. Southwell, "Wave-front estimation from wave-front slope measurements", J. Opt. Soc. Am, 70, pp.998~1006 (1980)
- J. Hermann, "Least-squares wave-front errors of minimum norm", J. Opt. Soc. Am, 70, pp.28~35 (1980)
- R. R. Shannon, "Applied optics and optical engineering" (1992), Aademic Press
- N. Devaney, "Correction of ocular and atmospheric wavefronts: a comparison of the performance of various deformable mirrors", Appl. Opt, 47, pp.6550~6562 (2008)