EP0100242A2
Expired / Lapsed
EP
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Optical system for a laser
Assignee: Xerox Corp
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Filing: 1983-07-28
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Granted: —
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Expires: 2003-07-28
Abstract
Abstract An optical system for collimating the radiation from a semiconductor laser (70), the laser near field having a single beam waist position in a first direction and having an elongated but phase-coherent near field emitting pattern in a second direction which forms a far field low-divergence beam pattern, the optical system characterized by a lens system for imaging said near field of said single beam waist position in the first spatial direction while imaging the elongated, phase-coherent far field radiation pattern in the second direction. The laser is a multi-emitter or broad emitter semiconductor laser capable of producing one or more output beams. The lens system may include focusing optics to focus radiation in the near field pattern emitted from the laser in the first direction and in the far field pattern of radiation emitted from the laser in the second direction.
Inventors
- 👤 Donald R. Scifres
- 👤 Robert A. Sprague
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 14:17
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/09; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G02B19/0052; G02B27/0938; G02B27/095; G02B27/0955; G02B27/0966
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
79 words
An optical system for a multi-emitter or broad emitter semiconductor laser (70) capable of producing one or more output beams (72) of small spatial extent in a first direction and provides a phase-coherent low-divergence radiation pattern in a second direction, characterised by a lens system (76, 78) to focus radiation in the near field pattern emitted from said laser in said first direction, and in the far field pattern of radiation emitted from said laser in said second direction.
Claim 2
Dependent Claim
79 words
An optical system for a multi-emitter or broad emitter semiconductor laser (70) capable of producing one or more output beams (72) of small spatial extent in a first direction and provides a phase-coherent low-divergence radiation pattern in a second direction, characterised by a lens system (76, 78) to focus radiation in the near field pattern emitted from said laser in said first direction, and in the far field pattern of radiation emitted from said laser in said second direction.
Claim 3
Dependent Claim
29 words
The optical system of claim 1 wherein said lens system does not include final focusing objective thereby producing a collimated output beam in both said first and second directions.
Claim 4
Dependent Claim
15 words
The optical system of 1 or 2 wherein said first and second directions are orthogonal.
Claim 5
Dependent Claim
15 words
The optical system of 1 or 2 wherein said first and second directions are orthogonal.
Claim 6
Dependent Claim
24 words
The optical system of any preceding claim, wherein said optical beam output is brought into focus in a single spot by said lens system.
Claim 7
Dependent Claim
65 words
The optical system of any preceding claim, wherein said lens system comprises a spherical collecting lens (75') to collimate said beam putput in said first direction and form an aerial image in said second direction, a cylinder lens (76') to collimate said beam output in said second direction, and a focusing lens (78) to bring the combined collimated beam to focus at an image plane.
Claim 8
Dependent Claim
37 words
The optical system of either claim 1 or 2 wherein means (79, 79') are provided to aperture said far field radiation pattern to block one or more lower power diffraction orders present in said far field pattern.
Claim 9
Dependent Claim
42 words
The optical system of any preceding claim, wherein either a multifaceted prism reflector or diffraction grating (100) is included in said optical system to cause all beams in said optical beam output to focus in the same spot at an image plane.
Claim 10
Dependent Claim
97 words
The optical system of any of claims 1-4, wherein said first lens system comprises a cylinder lens and spherical lens and second lens system includes said spherical lens, the divergence angle of radiation emitted from said laser in both directions corrected by adjusting the distance, Li, of said cylinder lens from said laser to be slightly less than the focal length, f 1 of said cylinder lens and by adjusting the distance, L 2 , of said spherical lens from said image plane to slightly greater than the focal length, f 2 , of said spherical lens.
Claim 11
Dependent Claim
88 words
An optical system for collimating the radiation from a semiconductor laser, (70) the laser near field having a single beam waist position in a first spatial direction and having an elongated but phase coherent near field emitting pattern in a second spatial direction which forms a far field low divergence beam pattern, characterized by a lens system for imaging said near field of said single beam waist position in said first spatial direction, and for imaging said elongated, phase coherent far field radiation pattern in said second direction.
Claim 12
Dependent Claim
88 words
An optical system for collimating the radiation from a semiconductor laser, (70) the laser near field having a single beam waist position in a first spatial direction and having an elongated but phase coherent near field emitting pattern in a second spatial direction which forms a far field low divergence beam pattern, characterized by a lens system for imaging said near field of said single beam waist position in said first spatial direction, and for imaging said elongated, phase coherent far field radiation pattern in said second direction.
Claim 13
Dependent Claim
22 words
The optical system of claim 9 wherein said elongated emitting pattern comprises two or more spatially separated but phase coherent emitting regions.
Claim 14
Dependent Claim
29 words
The: optical system of claim 9 or 10, wherein the output provided by said lens system is a single beam collimated in both said first and second spatial directions.
Claim 15
Dependent Claim
33 words
The optical system of claim 9 or 10, wherein the output provided by said lens system is a single beam focused in both said first and second spatial directions onto an image plane.
Claim 16
Dependent Claim
40 words
The optical system of claim 12 wherein said lens system includes means (79) to aperture said elongated, phase coherent far field beam pattern in said second spatial direction to limit the angle of acceptance of said far field beam pattern.
Claim 17
Dependent Claim
39 words
The optical system of claim 12 wherein said lens system includes means to aperture far field beam pattern in said second spatial direction to block one or more lower power diffraction orders present in said far field beam pattern.
Claim 18
Dependent Claim
57 words
The optical system of claim 12 wherein said lens system includes a combination of a cylinder lens and a spherical lens, said lenses having a focal length to substantially collimate and refocus said beam in said first spatial direction and said spherical lens also having a focal length to focus said beam in said second spatial direction.
Claim 19
Dependent Claim
69 words
The optical system of claim 12 wherein said lens system includes a combination of a cylinder lenses, one cylinder lens having a focal length to refocus said beam in said first spatial direction onto said image plane and a combination of a second and third cylinder lenses to focus said beam in said second spatial direction and refocus said beams in said second spatial direction to said image plane.
Claim 20
Dependent Claim
94 words
The optical system of claim 12 wherein said lens system includes a combination of a cylinder lenses, one cylinder ler,s having a focal length to refocus said beam in said first spatial direction to said image plane and a combination of a second and third cylinder lenses to focus said beam in said second spatial direction to a spot and refocus said spot in said second spatial direction to said image plane, and a slit aperture positioned to .limit the angle of acceptance of said beam in said second spatial direction at said spot.
Claim 21
Dependent Claim
105 words
The optical system of claim 12 wherein said lens system includes a combination of a cylinder lens and a pair of spherical lenses, said spherical lenses having a focal length to respectively collimate and refocus said beam in said first spatial direction onto said image plane, the first of said spherical lenses also positioned to focus said beam in said second spatial direction to a spot, said cylinder lens to therafter refocus said spot and collimate said beam in said second spatial direction and the second of said spherical lenses also positioned to focus said beam in said second spatial direction onto said image plane.
Claim 22
Dependent Claim
29 words
The optical system of any one of the claims 9 through 18 wherein said first and second spatial directions are othogonal relative to the emitting junction of said laser.
References Cited (Backward Citations)
No citation records indexed.
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