Title:
LASER APPARATUS
Document Type and Number:
WIPO Patent Application WO2002082593
Kind Code:
A3
Abstract:
Laser apparatus comprises a laser assembly (30) for producing light having multiple lobes in its far field intensity pattern. A light feedback element (37) forms a resonant external cavity with the laser assembly (30) for returning to the laser assembly light (34) derived from a first lobe of the light produced by the laser assembly, an output beam (35) being derived from a second lobe. The light feedback element has a reflective surface (38) for reflecting back to the laser assembly light incident on the reflective surface. A spatial filter restricts the transverse modes of the feedback light to one or more selected transverse modes, and includes a masking element (41) positioned between the reflective surface and the laser assembly. The spatial filter is formed by a pair of opposed edges (39, 40) comprising an edge (39) of the reflective surface and an edge (40) of the masking element (41).
Inventors:
PEDERSEN CHRISTIAN (DK)
SHENG WEIDONG (DK)
SHENG WEIDONG (DK)
Application Number:
PCT/EP2002/003756
Publication Date:
December 19, 2002
Filing Date:
April 04, 2002
Export Citation:
Assignee:
TORSANA LASER TECHNOLOGIES AS (DK)
PEDERSEN CHRISTIAN (DK)
SHENG WEIDONG (DK)
PEDERSEN CHRISTIAN (DK)
SHENG WEIDONG (DK)
International Classes:
H01S5/40; H01S5/14; (IPC1-7): H01S5/40; H01S5/14
Domestic Patent References:
| WO1998056087A1 | 1998-12-10 | |||
| WO1998015994A1 | 1998-04-16 |
Foreign References:
| US5430748A | 1995-07-04 |
Other References:
PILLAI R M R ET AL: "PARAXIAL-MISALIGNMENT INSENSITIVE EXTERNAL-CAVITY SEMICONDUCTOR- LASER ARRAY EMITTING NEAR-DIFFRACTION LIMITED SINGLE-LOBED BEAM", IEEE JOURNAL OF QUANTUM ELECTRONICS,IEEE INC. NEW YORK,US, vol. 32, no. 6, 1 June 1996 (1996-06-01), pages 996 - 1008, XP000590108, ISSN: 0018-9197
YAELI J ET AL: "ARRAY MODE SELECTION UTILIZING AN EXTERNAL CAVITY CONFIGURATION", APPLIED PHYSICS LETTERS,AMERICAN INSTITUTE OF PHYSICS. NEW YORK,US, vol. 47, no. 2, 15 July 1985 (1985-07-15), pages 89 - 91, XP000706628, ISSN: 0003-6951
YAELI J ET AL: "ARRAY MODE SELECTION UTILIZING AN EXTERNAL CAVITY CONFIGURATION", APPLIED PHYSICS LETTERS,AMERICAN INSTITUTE OF PHYSICS. NEW YORK,US, vol. 47, no. 2, 15 July 1985 (1985-07-15), pages 89 - 91, XP000706628, ISSN: 0003-6951
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