Ph.D student demonstrates a single, working laser on silicon
This is neither low cost nor commercially relevant. It’s an exotic, low-temperature (so incompatible with subsequent steps of most wafer processes) deposition of rare earth material. The lasing wavelength is all wrong (1.9 um). It requires a pump laser in the 1.6 um range which is the usual range of interest. The efficiency is not very good. Couldn’t find the linewidth while scanning rapidly. It’s a run of the mill academic paper.There exist commercial electrically pumped lasers on silicon that are being continuously improved through different approaches. Intel is one of the leaders on that.