Intel has published two papers in Nature on silicon lasers. The first one (Nature, vol. 433, pp. 292 – 294, 20 January 2005) describes a pulsed laser; the second one (Nature, vol. 433, pp. 725 – 728, 17 February 2005) describes a continuous wave laser (an even bigger achievement). The text and figures in the actual Intel papers clearly indicate that SOI material was used in the development of the Intel silicon lasers.