Extremely high-brightness tapered photonic crystal diode laser with narrow-emitting aperture

High-brightness tapered photonic crystal diode lasers in the 980 nm range are investigated. The tapered lasers with a 20 mu m wide light-emitting aperture achieved 2.55 W at 3.2 A. The beam quality factor M-2 in the vertical and lateral directions are 1.16 and 1.48 at 2.5 A. Maximum brightness of 126.8 MW cm(-2). sr at the second moment level is achieved. The devices also shows a narrow far-field of 17.1 degrees x 6.5 degrees in the vertical and lateral directions and a high efficiency of 53%. The proportion of the first-order mode in the lasing emission is also investigated based on the measured beam quality factor. (C) 2019 The Japan Society of Applied Physics