中国科学院南京天文光学技术研究所机构知识库

The 12-m optical infrared telescope is a proposed large-scale general-purpose tele scope in China.This telescope will integrate Ground Layer Adaptive Optics(GLAO) to effectively mitigate the effects of atmosphere turbulence within a 14′field of view, thereby enhancing observational efficiency and scientific performance.To system atically assess the correction capabilities of the 12-m telescope with GLAO under various error conditions,simulations were conducted using the Durham Adaptive Optics Simulation Program.The correction performance is highly dependent on the atmospheric turbulence model,guide star,and wavefront sensor system configura tions.Under typical site conditions with seeing of 0.8″,the GLAO system can correct ∼70%turbulence in the ground layer,resulting in a full width at half maximum (FWHM)of 0.35″at 840 nm and 0.27″at 1200 nm,corresponding to correction gains of 1.6×and 1.9×,respectively.The system also achieves a 1.3×improvement in half-light radius(θ5 0)and 2.0×enhancement in encircled energy within 200 milliarc seconds(EE2 00 mas).Additional system aberrations,including system pupil shape, phasing,alignment,and noncommon path aberrations,introduce measurable per formance degradation:increasing FWHM by 10.0%(840 nm)and 3.0%(1200 nm), θ5 0by 15.0%and 8.7%,and reducing EE 200 masby 24.0%and 9.4%,respectively.
We also investigate the impact of large-aperture adaptive deformable mirrors,simu lated by finite element software,on the performance of GLAO system.Key factors such as influence function,conjugate height,tilt angle and off-zenith observation are considered.