Reducing the Aberrations of Holographic Images of Underwater Particles by Using the Off-axis Scheme with Normal Incidence of Object Beam

V. Dyomin, John Watson, Philip William Benzie

Research output: Contribution to conferenceOther

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 mum at a wavelength of 0.532 mum, 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 mum and 200 mum 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 lambda=0.633 mum and at lambda=0.542 mum. 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
Number of pages4
DOIs
Publication statusPublished - Jun 2007
EventOCEANS 2007: Europe - Aberdeen, United Kingdom
Duration: 18 Jun 200721 Jun 2007
https://www.tib.eu/en/search/id/TIBKAT%3A557478170/ (Link to Conference proceedings from TIB)

Conference

ConferenceOCEANS 2007: Europe
CountryUnited Kingdom
CityAberdeen
Period18/06/0721/06/07
Internet address

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aberration
incidence
astigmatism
rectangles
hexagons
photolithography
triangles
recording
illumination
glass
air
predictions
wavelengths
water

Cite this

Reducing the Aberrations of Holographic Images of Underwater Particles by Using the Off-axis Scheme with Normal Incidence of Object Beam. / Dyomin, V.; Watson, John; Benzie, Philip William.

2007. OCEANS 2007: Europe, Aberdeen, United Kingdom.

Research output: Contribution to conferenceOther

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N2 - 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 mum at a wavelength of 0.532 mum, 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 mum and 200 mum 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 lambda=0.633 mum and at lambda=0.542 mum. 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.

AB - 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 mum at a wavelength of 0.532 mum, 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 mum and 200 mum 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 lambda=0.633 mum and at lambda=0.542 mum. 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.

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