Reducing the aberrations of holographic images of underwater particles by using the off-axis scheme with normal incidence of object beam

Victor V. Dyomin, John Watson, Philip W. Benzie

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In this paper we describe a method of recording by combining back-illumination of in-line objects with an off-axis reference beam to produce low-aberration holograms. This is advantageous since at the reconstruction stage no extra means of compensation are required. Calculations have shown that the spherical aberration does not exceed 5% for objects from 100 to 200 μm at a wavelength of 0.532 μm, the longitudinal spherical aberration does not exceed 1%, and astigmatism does not exceed 1%. A series of holograms were recorded to confirm the above predictions. Two targets consisting of arrays of squares, triangles, hexagons, rectangles and circles with dimensions of 100 μm and 200 μm were fabricated on glass plates by photolithography. Holograms were recorded with the objects placed in air or in water at various distances. After processing, holograms were replayed at λ= 0.633 μm and at λ=0.542 μm. More than 100 images were compared with the original targets for shape, dimensions and evidence of aberrations. Corresponding particles sizes differ by no more than 10%. The above experiments allow us to conclude that use the off-axis scheme with normal incidence of object beam on holoplates can provide a reduction of aberrations without any additional compensation at reconstruction stage.

Original languageEnglish
Title of host publicationOCEANS 2007 - Europe
Publication statusPublished - 28 Nov 2007
Externally publishedYes
EventOCEANS 2007 - Europe - Aberdeen, Scotland, United Kingdom
Duration: 18 Jun 200721 Jun 2007

Publication series

NameOCEANS 2007 - Europe

Conference

ConferenceOCEANS 2007 - Europe
CountryUnited Kingdom
CityAberdeen, Scotland
Period18.6.0721.6.07

Keywords

  • Holography
  • Optical distortion
  • Particle measurements
  • Underwater equipment

ASJC Scopus subject areas

  • Computer Science Applications
  • Oceanography
  • Ocean Engineering
  • Modelling and Simulation

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