Watt-class blue vertical-cavity surface-emitting laser arrays

We have successfully demonstrated a high output power of 1.19 W from a two-dimensional 16 x 16 blue GaN-based vertical-cavity surface-emitting laser (VCSEL) array under continuous wave operation at a lasing wavelength of 447 nm. A 256-element VCSEL array exhibited a high-quality far-field beam pattern with a circular shape and narrow divergence angle of around 7 degrees. A very small shift of the lasing wavelength with a change in the dissipated power of 0.05 nm W-1 revealed a very low thermal resistance of 3.4 K W-1. (C) 2019 The Japan Society of Applied Physics