High-power 980-nm DFB RW lasers with a narrow vertical far field

We compare 980-nm distributed-feedback ridge-waveguide lasers having cavity lengths of 1.5 and 3 mm. The maximum single-mode output powers are 500 and 700 mW, respectively. The full-width at half-maximum of the vertical far-field profile is only 22/spl deg/ due to a superlarge optical cavity.