Osram Opto-Semiconductors of Regensburg, Germany has reported ‘true green’ (520–570nm) laser diodes (LDs) on traditional c-plane free-standing gallium nitride (GaN) substrates [Adrian Avramescu et al, Appl. Phys. Express, vol3, p061003, 2010]. The researchers achieved continuous-wave (cw) 524nm laser emissions with output power of 50mW and wall-plug efficiencies as high as 2.3%. Pulsed-mode operation allowed even longer wavelengths of 531.7nm to be produced.

via Semiconductor Today.