Journal article
Near-diffraction-limited segmented broad area diode laser based on off-axis spectral beam combining
The beam quality of a 500-mu m-wide broad area diode laser with five active segments has been improved beyond the beam quality of the individual segments. The principle of this new laser system is based on off-axis feedback in combination with spectral beam combining. By using a double-feedback scheme we are able to improve the beam quality of the laser by a factor of 23 from M-2 = 55 for the free-running diode laser to M-2 = 2.4 for the laser with feedback at a drive current of 2.2 A.
The improved M-2 value is a factor of 3.4 below M-2 = 8.2 for a single free-running segment. This is the first time that the beam quality of a segmented broad area diode laser has been improved beyond the beam quality of the individual segments.
Language: | English |
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Publisher: | Springer-Verlag |
Year: | 2006 |
Pages: | 225-228 |
Journal subtitle: | Lasers and Optics |
ISSN: | 14320649 and 09462171 |
Types: | Journal article |
DOI: | 10.1007/s00340-006-2159-4 |
ORCIDs: | Jensen, O.B. , Andersen, Peter E. and Petersen, P.M. |
Beam Quality Broad Area Laser External Cavity Individual Segment Slow Axis