Research on fiber-feed stellar interferometer with wavefront control

在将光送入光纤或波导光学系统之前，需要对大气畸变波前进行校正。为了校正畸变波前，有必要采用某种方法对波前进行检测。提出了一种利用望远镜焦平面上的点扩散函数估计畸变波前的新方法。我们进行了几次计算机模拟来测试我们的方法。我们证明了畸变波前可以由一个有噪声的点扩散函数估计出来。利用估计的波前信息，可以采用分段反射镜或连续面片反射镜对畸变波前进行校正。如何检测光程差并对其进行校正是恒星干涉仪发展的重要因素之一。我们开发了一种利用信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来检测光程差的方法。实例表明，该方法可用于精确检测光程差。我们已经证明了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了空气色散的影响可以从望远镜的两束光束形成的空间条纹图中检测到。

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.