Research on fiber-feed stellar interferometer with wavefront control

希望在将光馈入光纤或波导光学器件之前校正大气失真的波前。为了对变形的波前进行校正，有必要对波前进行传感。我们提出了一种由望远镜焦平面上的点扩散函数来估计扭曲波前的新方法。我们进行了几次计算机模拟来测试我们的方法。我们证明了一个扭曲的波前可以从一个有噪声的点扩散函数中估计出来。利用估算的波前信息，可以用分段镜或连续面片镜对变形的波前进行校正，而光程差的检测和校正是研制恒星干涉仪的一个重要因素。我们研制了一种利用沟道光谱来校正光程差的光学系统。我们还测试了一种通过形成空间条纹图案来检测光程差的方法。结果表明，空气的色散对光程差的补偿起着至关重要的作用。我们通过光学模拟证明，从望远镜的两束光束形成的空间条纹图样中可以探测到空气弥散的影响。

It is desirable to correct atmospherically distorted wavefront before feeding the light into optical fiber or waveguide optics. In order to correct the distorted wavefront,it is necessary to sense the wavefront with some means. We proposed a new approach to estimate the distorted wavefront from the point-spread function at the focal plane of a telescope. We conducted several computer simulations to test our method. We showed that a distorted wavefront could be estimated from a noisy point-spread function. It is also shown that the distorted wavefront can be corrected by a segmented mirror or by a continuous face-sheet mirror with use of the information of the estimated wavefront.One of very important factors to develop stellar interferometer is the way how to detect the optical-path difference and to correct it. We developed an optical system to correct the optical-path difference with use of channeled spectrum. We also tested a method to detect the optical-path difference by forming spatial fringe pattern. This method is exemplified to be useful for the precise detection of the optical-path difference.We have shown that the dispersion of air causes crucial effects for the compensation of the optical-path difference. We demonstrated by optical simulation that the effect of the air dispersion could be detectable from the spatial fringe pattern formed with two beams from telescopes.