The interference pattern formed by the two-beam interferometry consists a series of parallel lines. The direction and period of these lines, in addition to the angle between the beams and their wavelengths, is also closely related to the wavefront forms of the beams. If at least one of the two wavefronts is not completely plane, a slight difference from the parallel lines pattern is expected. In this study, by examining moiré pattern of the resulting interference pattern with a copy of itself, the characteristics of the wavefronts such their convergence are determined by using reciprocal vectors approach. We show that, with this method one can remove a maximum curvature of the interference fringes of a several hundred meters.
 

Keywords: interfering fringes, moiré technique, reciprocal vector approach.

Full-Text [PDF 689 kb]   (577 Downloads)