The digital holographic interferometry (DHI) was utilized for investigatingthe optical properties of polymer and optical fibers. The samples investigatedhere were polyvinylidene fluoride (PVDF) polymer fiber and graded-index (GRIN)optical fiber. The phase shifting Mach-Zehnder interferometer was used toobtain five phase-shifted holograms, in which the phase difference between twosuccessive holograms is pi/2, for each fiber sample. These holograms wererecorded using a CCD camera and were combined to gain a complex wavefield,which was numerically reconstructed using the convolution approach intoamplitude and phase distributions. The reconstructed phase distribution wasused to determine the refractive index, birefringence and refractive indexprofile of the studied samples. The mean refractive index has been measuredwith accuracy up to 4 {\times} 10-4. The main advantage of DHI is to overcomethe manual focusing limitations by means of the numerical focusing. The resultsshowed accurate measurements of the optical properties of fibers.
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