Title:
LASER OSCILLATING DEVICE
Document Type and Number:
WIPO Patent Application WO/1991/020114
Kind Code:
A1
Abstract:
This invention relates to a high power laser oscillating device used for a cut-working of metal or non-metal, particularly to the one emitting a circularly polarized output beam. A rear mirror (10) is of a roof type reflecting mirror and its ridge (10a) forms an angle of pi/4 with a plane formed by the optical axes turned back. In this case, the reflection factor of the rear mirror (10) to a lineraly polarized component of the laser beam whose electric field vector is parallel to the direction of the ridge (10a) is larger than that to a linearly polarized component whose electric field vector is perpendicular to the direction. The laser beam in the resonator is polarized linearly in the direction of the ridge (10a) on the path between the rear mirror (10) and a turn-back mirror (11) the nearest to the rear mirror (10). This linearly polarized beam is reflected by the turn-back mirror (11). The turn-back mirror (11) delays the phases of the linearly polarized components parallel and perpendicular to the ridge (10a) by pi/2. Therefore, the obtained output beam (13) is a circularly polarized one. Accordingly, the structure of the device is simplified and the size thereof can be reduced. Also, the cost thereof can be reduced. Further, when performing cut-working, the pointing stability of the laser beam and the cutting characteristic are improved.
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Inventors:
KARUBE NORIO (JP)
Application Number:
PCT/JP1991/000720
Publication Date:
December 26, 1991
Filing Date:
May 28, 1991
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
G02B5/30; G02B27/28; H01S3/08; H01S3/081; H01S3/086; (IPC1-7): H01S3/081
Foreign References:
| JPS6095985A | 1985-05-29 | |||
| JPS59205780A | 1984-11-21 | |||
| JPS62169385A | 1987-07-25 | |||
| JPS6391618A | 1988-04-22 | |||
| JPS56138974A | 1981-10-29 | |||
| JPH01181484A | 1989-07-19 |
Other References:
See also references of EP 0485619A4
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