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Phase shift calibration based on Fresnel diffraction from phase plates

Aalipour, R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1088/2040-8978/14/12/125706
  3. Publisher: 2012
  4. Abstract:
  5. When a transparent plane-parallel plate is illuminated at a boundary region by a parallel monochromatic beam of light, Fresnel diffraction occurs because of the abrupt change in phase imposed by the finite change in refractive index at the plate boundary. The intensity of the diffraction fringes varies periodically with changes in the optical path difference of the light passing through the plate edge. The optical path difference depends on the incident angle of the light, the refractive index of the plate and surrounding medium, and the wavelength of the light. Plotting the intensity of the diffraction fringes versus optical path difference provides a general phase shift method for phase change measurement, in which the phase shift is made by changing the incident angle. Using this technique we have measured the phase change imposed by the refractive index profile of a single mode optical fiber
  6. Keywords:
  7. optical fiber ; Phase-shift method ; phase measurement ; Boundary regions ; Fresnel diffraction ; In-phase ; Incident angles ; Monochromatic beam ; Optical path difference ; Phase Change ; Phase Plate ; Fresnel diffraction ; Plane-parallel plates ; Plate boundaries ; Plate edges ; Refractive index profiles ; Single-mode optical fiber ; Optical fibers ; Phase measurement ; Phase shift ; Phase shifters ; Refractive index ; Diffraction
  8. Source: Journal of Optics (United Kingdom) ; Volume 14, Issue 12 , 2012 ; 20408978 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/2040-8978/14/12/125706/meta;jsessionid=1BC5F28D23C1AFF799F4F5DD46784ABF.c2.iopscience.cld.iop.org