Investigators pursue both electrical and optical pumping of silicon lasers.Dr. Bahram Jalali and Sasan Fathpour, University of California, Los AngelesCompound semiconductors have long been the workhorse for light generation and amplification in optoelectronic devices, whereas silicon has been the de facto standard for electronic integrated circuits. Driven by the material’s cost advantage, creating optoelectronic devices in silicon has been a subject of intense research. Such a technology, called silicon-based photonics, would be compatible with electronic integrated circuit and microelectromechanical systems (MEMS) technologies. 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