title: A novel method for identifying the order of interference using phase-shifting digital holography.
abstract: In this paper, we introduced a mathematical method for measuring the optical path length differences (OPDs), which is suitable for large OPD values where the fringes connections are difficult to detect. The proposed method is based on varying the width of the fringes, without changing the wavelength of the used coherent source. Also, in this work, we discussed the need for such method in off-axis phase-shifting digital holography. Low-resolution off-axis holograms failed to detect the correct interference order. In general, off-axis phase-shifting digital holography is limited by the resolution of the captured holograms. The results obtained using our proposed technique were compared to the results obtained using off-axis phase-shifting digital holograms and conventional two-beam interferometry. Holograms were given for illustration.
authors.affiliation: Department of Physics, Faculty of Science, University of Mansoura, Mansoura, Egypt.
authors.forename: T Z N
authors.initials: TZ
authors.lastname: Sokkar
authors.affiliation: Department of Physics, Faculty of Science, University of Mansoura, Mansoura, Egypt.
authors.forename: K A
authors.initials: KA
authors.lastname: El-Farahaty
authors.affiliation: Department of Physics, Faculty of Science, University of Damietta, New Damietta, Egypt.
authors.forename: W A
authors.initials: WA
authors.lastname: Ramadan
authors.affiliation: Department of Physics, Faculty of Science, University of Damietta, New Damietta, Egypt.
authors.forename: H H
authors.initials: HH
authors.lastname: Wahba
authors.affiliation: Department of Physics, Faculty of Science, University of Mansoura, Mansoura, Egypt.|Department of Dental Biomaterials, Faculty of Oral and Dental Medicine, Delta University for Science and Technology, Gamasa, Egypt.
authors.forename: M I
authors.initials: MI
authors.lastname: Raslan
authors.affiliation: Department of Physics, Faculty of Science, University of Mansoura, Mansoura, Egypt.
authors.forename: A A
authors.initials: AA
authors.lastname: Hamza
keywords: Computed tomography; crazes; fibrils; holography; voids