Angled-cavity lasers with photonic-crystal structure and high-order surface gratings

980 nm angled-cavity laser diodes with photonic-crystal structures and high-order surface gratings (HSGs) were first designed and fabricated. These lasers were fabricated using standard photolithography on a single-growth wafer with a photonic crystal structure. In addition, the angled-cavity lasers with asymmetric HSGs offer a simple solution for laser emission with a high power, low divergence angle, and narrow spectral width. A continuous-wave output power of 848 mW facet–1 was experimentally obtained for a 100 μm-wide and 1 mm-long device. The lowest divergence angle and narrowest spectral width exhibited by these devices were 1.5° × 10.6° and 0.07 nm, respectively.