Patent EP0312652A1 successfully refreshed from Google Patents.
EP0312652A1
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Optical device with phase-locked diodelaser array
Assignee: Koninklijke Philips NV
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Filing: 1987-10-19
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Granted: —
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Expires: 2007-10-19
Abstract
Abstract An optical device is described comprising a phase-locked diodelaser array (10), radiating in a stable supermode, and a collimatorlens (46). By arranging a polarisation-rotator (22) and a polarisation-sensitive beam combiner (30ʹ) in the radiation path, the two radiation lobes (11, 12) are superposed so that a single radiation spot (S) can be obtained. The quality of the spot can be improved by an arrangement of a prim system (40) and a spatial filter (45) in the lateral far field.
Inventors
- 👤 Kimio C/O Int. Octrooibureau B.V. Tatsuno
- 👤 Jan C/O Int. Octrooibureau B.V. Opschoor
- 👤 Carolus Johannes Van Der Poel
- 👤 Ronald Reindert Drenten
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:11
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G02; G02B; G02B19/00; G02B19/0033; G02B19/0047; G02B19/0052; G02B19/0057; G02B19/0004; G02B19/0009; G02B19/0014; G02B27/00; G02B27/09; G02B27/0938; G02B27/095; G02B27/0972; G02B27/28; G11B7/12; G11B7/125; G11B7/127; G11B7/135; G11B7/1359; G11B7/1395; G11B7/1398
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
Optical device for delivering a single radiation beam, comprising a phase-locked diodelaser array and a collimatorlens, which laser array radiates in the highest order supermode having, in a lateral plane through the axis of symmetry of the radiation and parallel to the pn-junction layer of the laser array, two far field lobes, characterized in, that behind the collimatorlens are arranged, in this order, a polarisation rotator in the path of one of the lateral lobes and a polarisation-sensitive beam combiner in the paths of both lateral far field lobes.
Claim 2
Dependent Claim
89 words
Optical device for delivering a single radiation beam, comprising a phase-locked diodelaser array and a collimatorlens, which laser array radiates in the highest order supermode having, in a lateral plane through the axis of symmetry of the radiation and parallel to the pn-junction layer of the laser array, two far field lobes, characterized in, that behind the collimatorlens are arranged, in this order, a polarisation rotator in the path of one of the lateral lobes and a polarisation-sensitive beam combiner in the paths of both lateral far field lobes.
Claim 3
Dependent Claim
56 words
Optical device as claimed in Claim 1, characterized in that the beam combiner is a prism of Wollaston, and in that between the polarisation rotator and the prism of Wollaston a composed beam deflector is arranged for directing the axes of the radiations of the two lobes such as to intersect at the prism of Wollaston.
Claim 4
Dependent Claim
19 words
Optical device as claimed in Claim 2, characterized in that the composed bem deflector is a double optical wedge.
Claim 5
Dependent Claim
70 words
Optical device as claimed in Claim 2 or 3, characterized in that the prism of Wollaston comprises three component prisms of birefringent material arranged after each other, the two outer component prism having the same optical axes and substantially the same shape and dimensions, while the central component prism has a different shape and different dimensions and an optical axis perpendicular to the optical axes of the outer component prisms.
Claim 6
Dependent Claim
49 words
Optical device as claimed in Claim 1, characterized in that the polarisation-sensitive beam combiner comprises a first and a second birefringent plate which are parallel to each other, the optical axes of the plates having different directions each at 45 degrees with the plate surfaces and crossing each other.
Claim 7
Dependent Claim
23 words
Optical device as claimed in Claim 5, characterized in that a beam deflector is arranged between the collimatorlens and the first birefringent plate.
Claim 8
Dependent Claim
32 words
Optical device as claimed in Claim 5 or 6, characterized in that between the first and second birefringent plate a λ/2-plate is arranged, wherein λ is the wavelength of the diodelaser radiation.
Claim 9
Dependent Claim
74 words
Optical device as claimed in any one of Claims 1-7, characterized in that behind the polarisation-sensitive beam combiner are arranged, in this order, a prism system of at least one prism having in the lateral plane an entrance face inclined with respect to the axis of the incident radiation and an exit face perpendicular to the axis of the emergent radiation, and a spatial filter in the lateral far field of the diodelaser array.
Claim 10
Dependent Claim
66 words
Apparatus for optically recording an optical record carrier, comprising an optical head for generating a radiation spot modulated in intensity according to the information to be recorded, characterized in that the optical head comprises an optical device as claimed in any one of the preceding Claims and an objective lens for focussing the beam from said device into a diffraction-limited round spot on the record carrier.
Claim 11
Dependent Claim
60 words
Apparatus for reading a record carrier comprising an optical head wherein a radiation spot is generated for scanning the record carrier, characterized in that the optical head comprises an optical head as claimed in any one of Claims 1 to 8 and an objective lens for focussing the beam from said device into a diffraction-limited spot on the record carrier.
Claim 12
Dependent Claim
79 words
Apparatus for laser printing of information on a recording medium, comprising a recording medium carrier movable in a first direction and a beam deflector for scanning a radiation beam along a second direction perpendicular to the first direction, characterized in that it comprises an optical device as claimed in any one of the Claims 1 to 8 for generating a substantially collimated beam that is focussed by an objective lens to a diffraction-limited radiation spot on the recording medium.
Claim 13
Dependent Claim
29 words
Apparatus as claimed in Claim 9, 10 or 11, characterized in that the spatial filter of the optical device is constituted by the entrance pupil of the objective lens.
References Cited (Backward Citations)
EP0100242A2
Cited
WO1985001590A1
Cited
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