Research on fiber-feed stellar interferometer with wavefront control

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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.