, Volume 83, Issue 2, pp 225-228
Date: 17 Mar 2006

Near-diffraction-limited segmented broad area diode laser based on off-axis spectral beam combining

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Abstract

The beam quality of a 500-μm-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 M2=55 for the free-running diode laser to M2=2.4 for the laser with feedback at a drive current of 2.2 A. The improved M2 value is a factor of 3.4 below M2=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.