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 16×16 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°. A very small shift of the lasing wavelength with a change in the dissipated power of 0.05 nm/W revealed a very low thermal resistance of 3.4 K/W.