Narrow Vertical Far-Field 975-nm Broad-Area DFB Lasers for Wide Temperature Range Operation

Published in:
IEEE Photonics Technol. Lett., vol. 21, no. 9, pp. 593-595 (2009).
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Abstract:
We report on 100-µm-wide 975-nm distributed-feedback lasers with a cavity length of 2 mm, which deliver 2.4 W within a 14° vertical far-field angle (full-width at half-maximum) and 35% power conversion efficiency in combination with a spectral linewidth of 0.27 nm (95% power content). The epitaxial design is a compromise between a narrowvertical far-field and a good power conversion efficiency, as required for application as a pump source. Narrow linewidth operation is sustained to 100°C, enabled by use of a grating with a high coupling coefficient.

Index Terms:
Distributed-feedback (DFB) lasers, power conversion, pumping of lasers, semiconductor lasers.

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