GB1278594A - Holographic system having an improved signal-to-noise ratio - Google Patents

Holographic system having an improved signal-to-noise ratio

Info

Publication number
GB1278594A
GB1278594A GB2958268A GB2958268A GB1278594A GB 1278594 A GB1278594 A GB 1278594A GB 2958268 A GB2958268 A GB 2958268A GB 2958268 A GB2958268 A GB 2958268A GB 1278594 A GB1278594 A GB 1278594A
Authority
GB
United Kingdom
Prior art keywords
polarized
reference beam
noise ratio
plane
diffuser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2958268A
Inventor
David Leslie Greenaway
John Patrick Russell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Priority to GB2958268A priority Critical patent/GB1278594A/en
Priority to CH951069A priority patent/CH510889A/en
Priority to DE19691931259 priority patent/DE1931259A1/en
Publication of GB1278594A publication Critical patent/GB1278594A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0486—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/31—Polarised light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/14—Diffuser, e.g. lens array, random phase mask

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

1278594 Holography R C A CORPORATION 10 Sept 1969 [20 June 1968] 29582/68 Heading G2J Signal-to-noise ratio of holograms is improved by increasing the proportion of the object beam polarized parallel to the reference beam and decreasing the proportion of the object beam polarized orthogonal to the reference beam. In one embodiment a reference beam 16 of plane polarized light is expanded to form a beam 20 and illuminates a hologram plate 22. An object beam 18 from the same light source is passed through a diffuser 28 to render it randomly polarized and then through a linear polarizer 30 to pass substantially only that portion polarized parallel to the reference beam 20 thereby cutting out that portion of the beam which carries only noise. The beam is then passed through a transparency and a hologram 22 is formed with improved signal-to-noise ratio. In an alternative embodiment the object beam directly illuminates an object without either diffuser or linear polarizer, but a quarter-wave plate oriented at 45 degrees to the plane of polarization of the reference beam is introduced into that latters' path to circularly polarize the reference beam. If the object has a plane polarizing effect upon an incident beam then a coherent light source forming randomly polarized beams may be used.
GB2958268A 1968-06-20 1968-06-20 Holographic system having an improved signal-to-noise ratio Expired GB1278594A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2958268A GB1278594A (en) 1968-06-20 1968-06-20 Holographic system having an improved signal-to-noise ratio
CH951069A CH510889A (en) 1968-06-20 1969-06-20 Device for recording holograms
DE19691931259 DE1931259A1 (en) 1968-06-20 1969-06-20 Device for recording a hologram

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2958268A GB1278594A (en) 1968-06-20 1968-06-20 Holographic system having an improved signal-to-noise ratio

Publications (1)

Publication Number Publication Date
GB1278594A true GB1278594A (en) 1972-06-21

Family

ID=10293819

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2958268A Expired GB1278594A (en) 1968-06-20 1968-06-20 Holographic system having an improved signal-to-noise ratio

Country Status (3)

Country Link
CH (1) CH510889A (en)
DE (1) DE1931259A1 (en)
GB (1) GB1278594A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8815660D0 (en) * 1988-07-01 1988-08-10 Nat Res Dev Underwater inspection apparatus & method
US6198554B1 (en) 1995-10-30 2001-03-06 Denso Corporation Method for producing a hologram and a display device using the same

Also Published As

Publication number Publication date
DE1931259A1 (en) 1970-01-02
CH510889A (en) 1971-07-31

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed