EP0097257A2
Expired / Lapsed
EP
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A method and apparatus for producing a light source of required shape
Assignee: International Business Machines Corp
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Filing: 1983-05-25
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Granted: —
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Expires: 2003-05-25
Abstract
Abstract Apparatus for producing a light source of a desired shape from a light source such as a laser comprising means for directing the light source along a predetermined path 10 as a playback beam to impinge upon a hologram 12 at a predetermined angle to produce the continuous self-luminous source of the desired shape. The hologram is recorded upon a substrate 28 coated with a photosensitive material 30 by interference between recording and object beams 24, 48 derived from the same source 20 of coherent radiation. The recording beam 24 is directed toward the substrate at an orientation and angle so that the playback beam 10 is a conjugate of the recording beam. The object beam 48 is directed to the substrate 28 over a path which includes a diffuser plate 36 covered with an opaque material in all areas except for a continuous area which defines the desired shape. The part of the object beam which impinges upon the substrate is limited by a stop 17 which defines the numerical aperture.
Inventors
- 👤 Kantilal Jain
- 👤 Milton Russell Latta
- 👤 Glenn Tavernia Sincerbox
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 05:24
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G03; G03F; G03F7/00; G03F7/70; G03F7/70058; G03F7/70091; G03F7/7015; G02B13/00; G02B13/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
167 words
Apparatus for producing a source of a desired shape and numerical aperture from a monochromatic light source comprising: means for directing the monochromatic light source along a predetermined path; means to position a hologram in a fixed position along said predetermined path so that said monochromatic light source impinges upon said hologram at a predetermined angle, said hologram having been formed by interference between a first and a second beam, both said first and second beams being derived from the same source of coherent radiation, said first and said second beam being directed by first and second optical means to a photosensitive medium, said second optical means comprising diffuser means having a non-diffusing region of the desired shape and said interference between said first and said second beam being recorded in said photosensitive medium to produce said hologram; said predetermined angle of said monochromatic light beam being chosen so that playback of said recorded hologram produces a continuous self-luminous source of said desired shape and numerical aperture.
Claim 2
Dependent Claim
167 words
Apparatus for producing a source of a desired shape and numerical aperture from a monochromatic light source comprising: means for directing the monochromatic light source along a predetermined path; means to position a hologram in a fixed position along said predetermined path so that said monochromatic light source impinges upon said hologram at a predetermined angle, said hologram having been formed by interference between a first and a second beam, both said first and second beams being derived from the same source of coherent radiation, said first and said second beam being directed by first and second optical means to a photosensitive medium, said second optical means comprising diffuser means having a non-diffusing region of the desired shape and said interference between said first and said second beam being recorded in said photosensitive medium to produce said hologram; said predetermined angle of said monochromatic light beam being chosen so that playback of said recorded hologram produces a continuous self-luminous source of said desired shape and numerical aperture.
Claim 3
Dependent Claim
16 words
Apparatus as claimed in claim 1, wherein said desired shape is an arc of a circle.
Claim 4
Dependent Claim
17 words
Apparatus as claimed in claim 1 or 2, wherein said monochromatic light source is an excimer laser.
Claim 5
Dependent Claim
19 words
Apparatus as claimed in claim 1, 2 or 3, wherein said hologram is a reflection or a transmission hologram.
Claim 6
Dependent Claim
45 words
Apparatus as claimed in claim 1 wherein said source of said desired shape is telecentric and wherein said first beam for recording said hologram and said monochromatic light source for playback of said recorded hologram are both incident on said hologram through a field lens.
Claim 7
Dependent Claim
30 words
Apparatus as claimed in claim 1 wherein said area of said hologram in which interference between said first and said second beam occurs is restricted to control said numerical aperture.
Claim 8
Dependent Claim
47 words
Apparatus as claimed in any one of claims 1 to 6, comprising a plurality of holograms mounted so that each hologram of said plurality can be selectively moved to the position along said predetermined path whereby said light source impinges upon said hologram at a predetermined angle.
Claim 9
Dependent Claim
24 words
Apparatus as claimed in claim 7, wherein each of said holograms of said plurality of holograms is recorded with a different finite numerical aperture.
Claim 10
Dependent Claim
37 words
Apparatus as claimed in any one of claims 1 to 8 in combination with and providing the light source for optical apparatus comprising a projecting system requiring a light source of a curved slit form or shape.
Claim 11
Independent Claim
157 words
A method of producing a light source of a desired shape, said method comprising the steps of:- a) forming a hologram representing the interference pattern between two coherent light beams by causing the two beams to interfere in the sensitive layer of an unexposed hologrpahic plate and thereafter developing the plate, one of said light beams having traversed an optical path including a diffuser plate having a clear zone corresponding in outline shape to the desired shape and a lens system collecting light passing through the diffuser plate and projecting it onto an unexposed holographic plate, and the other of said beams being incident on the holographic plate at a predetermined orientation and angle, and b) directing a playback beam of light onto the developed hologram along a path such that the playback beam follows the path of the conjugate beam to the aforesaid second beam thereby to produce a continuous self-luminous source of the desired shape.
Claim 12
Independent Claim
157 words
A method of producing a light source of a desired shape, said method comprising the steps of:- a) forming a hologram representing the interference pattern between two coherent light beams by causing the two beams to interfere in the sensitive layer of an unexposed hologrpahic plate and thereafter developing the plate, one of said light beams having traversed an optical path including a diffuser plate having a clear zone corresponding in outline shape to the desired shape and a lens system collecting light passing through the diffuser plate and projecting it onto an unexposed holographic plate, and the other of said beams being incident on the holographic plate at a predetermined orientation and angle, and b) directing a playback beam of light onto the developed hologram along a path such that the playback beam follows the path of the conjugate beam to the aforesaid second beam thereby to produce a continuous self-luminous source of the desired shape.
Claim 13
Dependent Claim
42 words
A method as claimed in claim 10, further comprising the step of positioning a stop to define the area of the unexposed holographic plate on which the first arid second beams are incident thereby to define the numerical aperture of the source.
Claim 14
Dependent Claim
179 words
Apparatus for producing an object light source of a desired shape and numerical aperture from a monochromatic light source comprising: means for directing a playback light beam from the monochromatic source along a predetermined path; a hologram storing a pattern representing said object light source, said hologram having been formed by interference between coherent object and reference beams, said object beam and said reference beam being directed respectively by first and second optical means to the photosensitive medium on the informed hologram, said first optical means comprising diffuser means having a non-diffusing region of the desired shape and said interference between said object and reference beams being recorded in said photosensitive medium to produce said hologram; means to position said hologram in a fixed position along said predetermined path so that said playback light beam impinges upon said holoarar at a predetermined angle; said predetermined angle being chosen so that the playback beam is the congugate beam of the reference beam and playback of said recorded holograr. produces a continuous self-luminous source of said desired shape and numerical aperture.
Claim 15
Dependent Claim
179 words
Apparatus for producing an object light source of a desired shape and numerical aperture from a monochromatic light source comprising: means for directing a playback light beam from the monochromatic source along a predetermined path; a hologram storing a pattern representing said object light source, said hologram having been formed by interference between coherent object and reference beams, said object beam and said reference beam being directed respectively by first and second optical means to the photosensitive medium on the informed hologram, said first optical means comprising diffuser means having a non-diffusing region of the desired shape and said interference between said object and reference beams being recorded in said photosensitive medium to produce said hologram; means to position said hologram in a fixed position along said predetermined path so that said playback light beam impinges upon said holoarar at a predetermined angle; said predetermined angle being chosen so that the playback beam is the congugate beam of the reference beam and playback of said recorded holograr. produces a continuous self-luminous source of said desired shape and numerical aperture.
References Cited (Backward Citations)
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