Abstract
A gain-guided laser diode having a curved-mirror-cavity that has coaxial mirrors and a fan-shaped stripe structure has been fabricated by dry etching. Although gain guided, the laser has an astigmatism of 4.1 μm, which is very low compared to conventional laser’s. The threshold current of the laser is 35 mA, the longitudinal mode spectrum is multiple, and the transverse optical mode is fundamental. These results are comparable to conventional gain-guided lasers. Etched mirror laser diodes with flat facets have been stably operated over 1500 h under automatic-power control at a power of 3 mW/facet at 50 °C, without facet coating
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