Proceedings PaperAutomatic Measurement Of Gradient Index Fiber Profile By Transverse Differential Shearing Interferometry
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A measurement of gradient index optical fiber profile by means of transverse differential shearing interferometry is described. By incorporating an automatic fringe processing system the accuracy of the fringe shift data reading equal to D/140 ( D - interfringe spacing) is obtained. Due to the accurate method of reconstruction of the profile from interferometric data the refraction of the probing beam is completely compensated. The immersion - cladding index mismatch is considered and it is shown that the immersion of refractive index higher then cladding refractive index can be used.