自适应光学中的非等晕性

ANISOPLANATISM IN ADAPTIVE OPTICS

本文讨论了自适应光学中非等晕域对补偿效果的影响,提出了一种减小非等晕性误差的新方法—位相梯度法。分析结果表明,该方法可显著增大有效校正的角范围,使非等晕性误差的影响大大减小。我们预期位相梯度法有望解决自适应光学中信标的非等晕性问题。

Anisoplanatism is a major limitation on performance of adaptive optical systems for overcoming the effects of atmospheric turbulence. To reduce anisoplanatic error we have introduced a new concept of 'Phase Derivative Adaptive Optics'-PDAO. In conventional adaptive systems only the beacon's wavefront phase is measured and then conjugated to compensate the atmospheric wavefront distortion in a desired path. In our PDAO system both the beacon's wavefront phase and phase derivative are measured. Then the predistortion phase is constructed with the phase and the phase derivative. This predistortion phase has been proven more precise to compensate the desired distortion. Thus the anisoplanatic residual phase error can be reduced and the isoplanatic patch size can be increased. We believe that PDAO is a prospective method to reduce anisoplanatism in adaptive optics.